diff --git a/src/main/java/component/LpPacketFragmentId.java b/src/main/java/component/LpPacketFragmentId.java
new file mode 100644
index 0000000..b24e62a
--- /dev/null
+++ b/src/main/java/component/LpPacketFragmentId.java
@@ -0,0 +1,102 @@
+package component;
+
+import encoding.*;
+
+/*
+ * @Author: Wang Feng
+ * @Description: 表示 LpPacket 中的分片id TLV
+ * @Version: 1.0.0
+ * @Date: 20:45 2021/4/5
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class LpPacketFragmentId implements TlvComponentBase,InitialAble,IEncodingAble{
+    // 成员变量
+    private long id;
+
+    // 函数
+    public long getId() {
+        return id;
+    }
+
+    public void setId(long id) {
+        this.id = id;
+        this.doInitial();
+    }
+
+    // 接口实现-变量区
+    private boolean initial=false;
+
+    // 接口实现-方法区
+    @Override
+    public void doInitial() {
+        initial=true;
+    }
+
+    @Override
+    public boolean isInitial() {
+        return initial;
+    }
+
+    /**
+     * 将 LpPacketFragmentId 线速编码为一个 TLV
+     * @param encoder
+     * @return
+     */
+    @Override
+    public int wireEncode(Encoder encoder) throws ComponentException {
+        try {
+            int totalLength=0;
+
+            // 编码 TLV-VALUE
+            int tmpLen=encoder.prependNonNegativeInteger(this.id);
+            if(tmpLen<=0){
+                return -1;
+            }
+            totalLength+=tmpLen;
+
+            // 编码 TLV-TYPE
+            tmpLen=encoder.prependVarNumber(new VlInt(totalLength));
+            if(tmpLen<=0){
+                return -1;
+            }
+            totalLength+=tmpLen;
+
+            // 编码 TLV-TYPE
+            tmpLen=encoder.prependVarNumber(new VlInt(TLV.TlvLpPacketFragmentId));
+            if(tmpLen<=0){
+                return -1;
+            }
+            totalLength+=tmpLen;
+
+            return totalLength;
+        } catch (EncoderException e) {
+            throw new ComponentException("LpPacketFragmentId.wireEncode: "+e.getMessage());
+        }
+    }
+
+    /**
+     * 从 TLV Block 中解码一个 LpPacketFragmentId
+     * @param block
+     * @return
+     */
+    @Override
+    public boolean wireDecode(Block block) throws ComponentException {
+        try {
+            // 检查 Type 是否正确
+            if (!TLV.expectType(block.getType(), new VlInt(TLV.TlvLpPacketFragmentId))) {
+                return false;
+            }
+
+            // 读取 value
+            long value = TLV.readNonNegativeInteger(block.getValue(), 0, block.getLength().getVlIntValue2Int());
+            if (value < 0) {
+                return false;
+            }
+            this.setId(value);
+
+            return true;
+        } catch (TLVException | VlIntException e) {
+            throw new ComponentException("LpPacketFragmentId.wireDecode: "+e.getMessage());
+        }
+    }
+}
diff --git a/src/main/java/component/LpPacketFragmentNum.java b/src/main/java/component/LpPacketFragmentNum.java
new file mode 100644
index 0000000..d0c01bd
--- /dev/null
+++ b/src/main/java/component/LpPacketFragmentNum.java
@@ -0,0 +1,102 @@
+package component;
+
+import encoding.*;
+
+/*
+ * @Author: Wang Feng
+ * @Description: 表示 LpPacket 中的分片数量 TLV
+ * @Version: 1.0.0
+ * @Date: 21:05 2021/4/5
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class LpPacketFragmentNum implements TlvComponentBase,InitialAble, IEncodingAble {
+    // 成员变量
+    private long fragmentNum;
+
+    // 函数
+    public long getFragmentNum() {
+        return fragmentNum;
+    }
+
+    public void setFragmentNum(long fragmentNum) {
+        this.fragmentNum = fragmentNum;
+        this.doInitial();
+    }
+
+    // 接口实现-变量区
+    private boolean initial=false;
+
+    // 接口实现-方法区
+    @Override
+    public void doInitial() {
+        initial=true;
+    }
+
+    @Override
+    public boolean isInitial() {
+        return initial;
+    }
+
+    /**
+     * 将 LpPacketFragmentNum 线速编码为一个 TLV
+     * @param encoder
+     * @return
+     */
+    @Override
+    public int wireEncode(Encoder encoder) throws ComponentException {
+        try {
+            int totalLength=0;
+
+            // 编码 TLV-VALUE
+            int tmpLen=encoder.prependNonNegativeInteger(this.fragmentNum);
+            if(tmpLen<=0){
+                return -1;
+            }
+            totalLength+=tmpLen;
+
+            // 编码 TLV-TYPE
+            tmpLen=encoder.prependVarNumber(new VlInt(totalLength));
+            if(tmpLen<=0){
+                return -1;
+            }
+            totalLength+=tmpLen;
+
+            // 编码 TLV-TYPE
+            tmpLen=encoder.prependVarNumber(new VlInt(TLV.TlvLpPacketFragmentNum));
+            if(tmpLen<=0){
+                return -1;
+            }
+            totalLength+=tmpLen;
+
+            return totalLength;
+        } catch (EncoderException e) {
+            throw new ComponentException("LpPacketFragmentNum.wireEncode: "+e.getMessage());
+        }
+    }
+
+    /**
+     * 从 TLV Block 中解码一个 LpPacketFragmentNum
+     * @param block
+     * @return
+     */
+    @Override
+    public boolean wireDecode(Block block) throws ComponentException {
+        try {
+            // 检查 Type 是否正确
+            if (!TLV.expectType(block.getType(), new VlInt(TLV.TlvLpPacketFragmentNum))) {
+                return false;
+            }
+
+            // 读取 value
+            long value = TLV.readNonNegativeInteger(block.getValue(), 0, block.getLength().getVlIntValue2Int());
+            if (value < 0) {
+                return false;
+            }
+            this.setFragmentNum(value);
+
+            return true;
+        } catch (TLVException | VlIntException e) {
+            throw new ComponentException("LpPacketFragmentNum.wireDecode: "+e.getMessage());
+        }
+    }
+}
diff --git a/src/main/java/component/LpPacketFragmentSeq.java b/src/main/java/component/LpPacketFragmentSeq.java
new file mode 100644
index 0000000..f8c0855
--- /dev/null
+++ b/src/main/java/component/LpPacketFragmentSeq.java
@@ -0,0 +1,102 @@
+package component;
+
+import encoding.*;
+
+/*
+ * @Author: Wang Feng
+ * @Description: 表示 LpPacket 中的分片号 TLV
+ * @Version: 1.0.0
+ * @Date: 21:11 2021/4/5
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class LpPacketFragmentSeq implements TlvComponentBase,InitialAble, IEncodingAble {
+    // 成员变量
+    private long fragmentSeq;
+
+    // 函数
+    public long getFragmentSeq() {
+        return fragmentSeq;
+    }
+
+    public void setFragmentSeq(long fragmentSeq) {
+        this.fragmentSeq = fragmentSeq;
+        this.doInitial();
+    }
+
+    // 接口实现-变量区
+    private boolean initial=false;
+
+    // 接口实现-方法区
+    @Override
+    public void doInitial() {
+        initial=true;
+    }
+
+    @Override
+    public boolean isInitial() {
+        return initial;
+    }
+
+    /**
+     * 将 LpPacketFragmentSeq 线速编码为一个 TLV
+     * @param encoder
+     * @return
+     */
+    @Override
+    public int wireEncode(Encoder encoder) throws ComponentException {
+        try {
+            int totalLength=0;
+
+            // 编码 TLV-VALUE
+            int tmpLen=encoder.prependNonNegativeInteger(this.fragmentSeq);
+            if(tmpLen<=0){
+                return -1;
+            }
+            totalLength+=tmpLen;
+
+            // 编码 TLV-TYPE
+            tmpLen=encoder.prependVarNumber(new VlInt(totalLength));
+            if(tmpLen<=0){
+                return -1;
+            }
+            totalLength+=tmpLen;
+
+            // 编码 TLV-TYPE
+            tmpLen=encoder.prependVarNumber(new VlInt(TLV.TlvLpPacketFragmentSeq));
+            if(tmpLen<=0){
+                return -1;
+            }
+            totalLength+=tmpLen;
+
+            return totalLength;
+        } catch (EncoderException e) {
+            throw new ComponentException("LpPacketFragmentSeq.wireEncode: "+e.getMessage());
+        }
+    }
+
+    /**
+     * 从 TLV Block 中解码一个 LpPacketFragmentSeq
+     * @param block
+     * @return
+     */
+    @Override
+    public boolean wireDecode(Block block) throws ComponentException {
+        try {
+            // 检查 Type 是否正确
+            if (!TLV.expectType(block.getType(), new VlInt(TLV.TlvLpPacketFragmentSeq))) {
+                return false;
+            }
+
+            // 读取 value
+            long value = TLV.readNonNegativeInteger(block.getValue(), 0, block.getLength().getVlIntValue2Int());
+            if (value < 0) {
+                return false;
+            }
+            this.setFragmentSeq(value);
+
+            return true;
+        } catch (TLVException | VlIntException e) {
+            throw new ComponentException("LpPacketFragmentSeq.wireDecode: "+e.getMessage());
+        }
+    }
+}
diff --git a/src/main/java/component/LpPacketHeader.java b/src/main/java/component/LpPacketHeader.java
new file mode 100644
index 0000000..2bdf7e4
--- /dev/null
+++ b/src/main/java/component/LpPacketHeader.java
@@ -0,0 +1,39 @@
+package component;
+
+import encoding.Block;
+import encoding.Encoder;
+import encoding.IEncodingAble;
+
+/*
+ * @Author: Wang Feng
+ * @Description:
+ * @Version: 1.0.0
+ * @Date: 21:18 2021/4/5
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class LpPacketHeader implements TlvComponentBase, IEncodingAble {
+    // 成员变量
+    private LpPacketFragmentId lpPacketFragmentId;
+    private LpPacketFragmentNum lpPacketFragmentNum;
+    private LpPacketFragmentSeq lpPacketFragmentSeq;
+
+    /**
+     * 将 LpPacketHeader 线速编码为一个 TLV
+     * @param encoder
+     * @return
+     */
+    @Override
+    public int wireEncode(Encoder encoder) throws ComponentException {
+
+    }
+
+    /**
+     * 从 TLV Block 中解码一个 LpPacketHeader
+     * @param block
+     * @return
+     */
+    @Override
+    public boolean wireDecode(Block block) throws ComponentException {
+
+    }
+}
diff --git a/src/main/java/encoding/TLV.java b/src/main/java/encoding/TLV.java
index 7f56cde..f442684 100644
--- a/src/main/java/encoding/TLV.java
+++ b/src/main/java/encoding/TLV.java
@@ -65,6 +65,13 @@ public class TLV {
     public static final int TlvCost           = 219; // 链路开销
     public static final int TlvExpires        = 220; // LogicFace超时时间，-1为不超时（never）
 
+    // LpPacket
+    public static final int TlvLpPacket            = 250; // LpPacket
+    public static final int TlvLpPacketHeader      = 251; // LpPacket Header
+    public static final int TlvLpPacketFragmentId  = 252; // LpPacket 分片id
+    public static final int TlvLpPacketFragmentNum = 253; // LpPacket 分片数
+    public static final int TlvLpPacketFragmentSeq = 254; // LpPacket 分片号
+
     // 目前已分配的最大的Tlv值，第一轮分配的最大值为500，超过该值则断定为不合法
     // TODO: 目前TLV值的分配，第一轮分配都在500以内，如果以后分配更高值时，需要修改此处的限制
     public static final int MaxTlvNum = 500;
diff --git a/src/main/java/packet/CPacket.java b/src/main/java/packet/CPacket.java
index 5150f48..7f00270 100644
--- a/src/main/java/packet/CPacket.java
+++ b/src/main/java/packet/CPacket.java
@@ -1,9 +1,6 @@
 package packet;
 
-import component.ComponentException;
-import component.IdentifierWrapper;
-import component.Payload;
-import component.TTL;
+import component.*;
 import encoding.*;
 
 /*
@@ -34,15 +31,74 @@ import encoding.*;
 //             }
 //
 public class CPacket implements InteractWithField, IEncodingAble {
-    private MINPacket minPacket;
-    private TTL ttl;
-    private Payload payload;
-    private String flatIdentifier; // 推式包拥有一个扁平的标识
+    public MINPacket minPacket=new MINPacket();
+    public TTL ttl=new TTL();
+    public Payload payload=new Payload();
+    public Identifier srcIdentifier=new Identifier();
+    public Identifier dstIdentifier=new Identifier();
 
-    public CPacket() {
-        minPacket = new MINPacket();
-        ttl = new TTL();
-        payload = new Payload();
+
+    /**
+     * 获取源标识
+     * @return
+     */
+    public Identifier getSrcIdentifier() {
+        return srcIdentifier;
+    }
+
+    /**
+     * 设置源标识
+     * @param srcIdentifier
+     */
+    public void setSrcIdentifier(Identifier srcIdentifier) {
+        this.srcIdentifier = srcIdentifier;
+    }
+
+    /**
+     * 获取目的标识
+     * @return
+     */
+    public Identifier getDstIdentifier() {
+        return dstIdentifier;
+    }
+
+    /**
+     * 设置目的标识
+     * @param dstIdentifier
+     */
+    public void setDstIdentifier(Identifier dstIdentifier) {
+        this.dstIdentifier = dstIdentifier;
+    }
+
+    /**
+     * 得到 TTL
+     *
+     * @return
+     */
+    public TTL getTtl() {
+        return ttl;
+    }
+
+    /**
+     * 设置 TTL
+     *
+     * @param ttl
+     */
+    public void setTtl(TTL ttl) {
+        this.ttl = ttl;
+    }
+
+    /**
+     * 展示目的标识
+     *
+     * @return
+     */
+    public String toUri() throws PacketException {
+        try {
+            return this.dstIdentifier.toUri();
+        } catch (ComponentException e) {
+            throw new PacketException("CPacket.toUri() :"+e.getMessage());
+        }
     }
 
     /**
@@ -59,12 +115,7 @@ public class CPacket implements InteractWithField, IEncodingAble {
             // 填充可变区 => 非受保护区
             // 首先清除所有的Block
             this.minPacket.mutableField.mutableDangerousField.clearBlocks();
-            Block block = null;
-            try {
-                block = new SelfEncodingBase().selfWireEncode(this.ttl);
-            } catch (EncoderException | BlockException | ComponentException e) {
-                throw new PacketException("CPacket.fillDataToFields: " + e.getMessage());
-            }
+            Block block = new SelfEncodingBase().selfWireEncode(this.ttl);
             if (block == null) {
                 return false;
             }
@@ -81,13 +132,16 @@ public class CPacket implements InteractWithField, IEncodingAble {
 
             // 填充标识区
             // 首先清除所有的标识
-            this.minPacket.identifierField.clearIdentifiers();
-            IdentifierWrapper identifierWrapper =
-                    new IdentifierWrapper().createCommonIdentifierByString(this.flatIdentifier);
-            if (identifierWrapper == null) {
-                return false;
+            if((this.srcIdentifier==null)||(this.dstIdentifier==null)){
+                throw new PacketException("CPacket.fillDataToFields: SrcIdentifier or DstIdentifier is null.");
             }
-            this.minPacket.identifierField.addIdentifier(identifierWrapper);
+            this.minPacket.identifierField.clearIdentifiers();
+            IdentifierWrapper srcIdentifierWrapper =
+                    new IdentifierWrapper(new VlInt(TLV.TlvIdentifierCommon),this.srcIdentifier);
+            IdentifierWrapper dstIdentifierWrapper =
+                    new IdentifierWrapper(new VlInt(TLV.TlvIdentifierCommon),this.dstIdentifier);
+            this.minPacket.identifierField.addIdentifier(srcIdentifierWrapper);
+            this.minPacket.identifierField.addIdentifier(dstIdentifierWrapper);
 
             return true;
         } catch (EncoderException | BlockException | ComponentException e) {
@@ -104,9 +158,7 @@ public class CPacket implements InteractWithField, IEncodingAble {
     public boolean extraDataFromFields() throws PacketException {
         try {
             // 提取 Payload
-            Block payloadBlock = null;
-            payloadBlock = this.minPacket.readOnlyField.getBlockByType(new VlInt(TLV.TlvPayload));
-
+            Block payloadBlock = this.minPacket.readOnlyField.getBlockByType(new VlInt(TLV.TlvPayload));
             if (payloadBlock == null) {
                 return false;
             }
@@ -124,14 +176,16 @@ public class CPacket implements InteractWithField, IEncodingAble {
             }
 
             // 提取标识
-            IdentifierWrapper commonIdentifier = this.minPacket.identifierField.getIdentifierByType(new VlInt(TLV.TlvIdentifierCommon));
-            if (commonIdentifier == null) {
+            IdentifierWrapper srcIdentifierWrapper = this.minPacket.identifierField.getIdentifier(0);
+            if (srcIdentifierWrapper == null) {
                 return false;
             }
-            String identifierString = commonIdentifier.toUri();
-            if ((identifierString.length() > 0) && (identifierString.startsWith("/"))) {
-                this.flatIdentifier = identifierString.substring(1);
+            IdentifierWrapper dstIdentifierWrapper  = this.minPacket.identifierField.getIdentifier(1);
+            if (dstIdentifierWrapper == null) {
+                return false;
             }
+            this.srcIdentifier=srcIdentifierWrapper.getIdentifier();
+            this.dstIdentifier=dstIdentifierWrapper.getIdentifier();
 
             return true;
         } catch (ComponentException e) {
@@ -149,7 +203,7 @@ public class CPacket implements InteractWithField, IEncodingAble {
     public int wireEncode(Encoder encoder) throws PacketException {
         // 首先将属性填充到分区当中
         if (!this.fillDataToFields()) {
-            return 0;
+            return -1;
         }
 
         // 指定包类型
@@ -172,48 +226,4 @@ public class CPacket implements InteractWithField, IEncodingAble {
         return this.extraDataFromFields();
     }
 
-    /**
-     * 展示平面标识
-     *
-     * @return
-     */
-    public String toUri() {
-        return this.flatIdentifier;
-    }
-
-    /**
-     * 设置推式包的平面标识，eg: asdfsvnjweivnjsdcs
-     *
-     * @param identifier
-     */
-    public void setIdentifier(String identifier) {
-        this.flatIdentifier = identifier;
-    }
-
-    /**
-     * 获取推式包的平面标识
-     *
-     * @return
-     */
-    public String getIdentifier() {
-        return this.flatIdentifier;
-    }
-
-    /**
-     * 得到 TTL
-     *
-     * @return
-     */
-    public TTL getTtl() {
-        return ttl;
-    }
-
-    /**
-     * 设置 TTL
-     *
-     * @param ttl
-     */
-    public void setTtl(TTL ttl) {
-        this.ttl = ttl;
-    }
 }
diff --git a/src/main/java/packet/Data.java b/src/main/java/packet/Data.java
index b6cf124..692a8fc 100644
--- a/src/main/java/packet/Data.java
+++ b/src/main/java/packet/Data.java
@@ -33,12 +33,12 @@ import encoding.*;
 //             }
 //
 public class Data implements IEncodingAble, InteractWithField {
-    private MINPacket minPacket;
-    private FreshnessPeriod freshnessPeriod;
-    private Payload payload;
-    private CongestionMark congestionMark;
-    private NackHeader nackHeader;
-    private Identifier name;
+    public MINPacket minPacket=new MINPacket();
+    public FreshnessPeriod freshnessPeriod=new FreshnessPeriod();
+    public Payload payload=new Payload();
+    public CongestionMark congestionMark=new CongestionMark();
+    public NackHeader nackHeader=new NackHeader();
+    public Identifier name=new Identifier();
 
     /**
      * 展示数据包的 URI
@@ -88,9 +88,7 @@ public class Data implements IEncodingAble, InteractWithField {
             this.minPacket.mutableField.mutableProtectField.clearBlocks();
 
             // CongestionMark
-            Block block = null;
-            block = new SelfEncodingBase().selfWireEncode(this.congestionMark);
-
+            Block block = new SelfEncodingBase().selfWireEncode(this.congestionMark);
             if (block == null) {
                 return false;
             }
@@ -110,11 +108,7 @@ public class Data implements IEncodingAble, InteractWithField {
 
             // FreshnessPeriod
             if (this.freshnessPeriod.isInitial()) {
-                try {
-                    block = new SelfEncodingBase().selfWireEncode(this.freshnessPeriod);
-                } catch (EncoderException | BlockException | ComponentException e) {
-                    throw new PacketException("Data.fillDataToFields: " + e.getMessage());
-                }
+                block = new SelfEncodingBase().selfWireEncode(this.freshnessPeriod);
                 if (block == null) {
                     return false;
                 }
@@ -123,11 +117,7 @@ public class Data implements IEncodingAble, InteractWithField {
 
             // NackHeader
             if (this.nackHeader.isInitial()) {
-                try {
-                    block = new SelfEncodingBase().selfWireEncode(this.nackHeader);
-                } catch (EncoderException | BlockException | ComponentException e) {
-                    throw new PacketException("Data.fillDataToFields: " + e.getMessage());
-                }
+                block = new SelfEncodingBase().selfWireEncode(this.nackHeader);
                 if (block == null) {
                     return false;
                 }
@@ -135,11 +125,7 @@ public class Data implements IEncodingAble, InteractWithField {
             }
 
             // Payload
-            try {
-                block = new SelfEncodingBase().selfWireEncode(this.payload);
-            } catch (EncoderException | BlockException | ComponentException e) {
-                throw new PacketException("Data.fillDataToFields: " + e.getMessage());
-            }
+            block = new SelfEncodingBase().selfWireEncode(this.payload);
             if (block == null) {
                 return false;
             }
@@ -186,7 +172,6 @@ public class Data implements IEncodingAble, InteractWithField {
                 if (!this.congestionMark.wireDecode(block)) {
                     return false;
                 }
-
             }
 
             /////////////////////////////////////////////////////////////
@@ -199,14 +184,8 @@ public class Data implements IEncodingAble, InteractWithField {
             ElementContainer elementContainer = this.minPacket.readOnlyField.getBlocks();
             int len = elementContainer.length();
             for (int i = 0; i < len; i++) {
-                Block newblock = null;
-                try {
-                    newblock = elementContainer.getBlock(i);
-                } catch (BlockException e) {
-                    throw new PacketException("Data.extraDataFromFields: " + e.getMessage());
-                }
-                int type;
-                type = newblock.getType().getVlIntValue2Int();
+                Block newblock = elementContainer.getBlock(i);
+                int type = newblock.getType().getVlIntValue2Int();
                 switch (type) {
                     case TLV.TlvFreshnessPeriod:
                         if (!this.freshnessPeriod.wireDecode(newblock)) {
@@ -235,7 +214,7 @@ public class Data implements IEncodingAble, InteractWithField {
             this.setName(interestIdentifierWrapper.getIdentifier());
 
             return true;
-        } catch (ComponentException | VlIntException e) {
+        } catch (ComponentException | VlIntException | BlockException e) {
             throw new PacketException("Data.extraDataFromFields: " + e.getMessage());
         }
     }
diff --git a/src/main/java/packet/IMINPacket.java b/src/main/java/packet/IMINPacket.java
new file mode 100644
index 0000000..0e95926
--- /dev/null
+++ b/src/main/java/packet/IMINPacket.java
@@ -0,0 +1,14 @@
+package packet;
+
+import encoding.IEncodingAble;
+
+/*
+ * @Author: Wang Feng
+ * @Description:
+ * @Version: 1.0.0
+ * @Date: 11:27 2021/4/2
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public interface IMINPacket{
+    boolean isPacketValid();
+}
diff --git a/src/main/java/packet/Interest.java b/src/main/java/packet/Interest.java
index 2e987f8..a2dd630 100644
--- a/src/main/java/packet/Interest.java
+++ b/src/main/java/packet/Interest.java
@@ -24,6 +24,7 @@ import encoding.*;
 //                 [InterestLifeTime]
 //                 [Nonce]
 //                 [HopLimit]
+//                 [NackHeader]
 //                 <Payload>
 //             }
 //             {                             => 可变区
@@ -31,20 +32,23 @@ import encoding.*;
 //                     [CongestionMark]
 //                 }
 //                 {                         => 非受保护区
-//                     "Empty"
+//                     [TTL]
 //                 }
 //             }
 //
 public class Interest implements InteractWithField, IEncodingAble {
-    private MINPacket minPacket;
-    private CanBePrefix canBePrefix;
-    private MustBeRefresh mustBeRefresh;
-    private InterestLifeTime interestLifeTime;
-    private Nonce nonce;
-    private HopLimit hopLimit;
-    private Payload payload;
-    private CongestionMark congestionMark;
-    private Identifier name;
+    public MINPacket minPacket=new MINPacket();
+    public CanBePrefix canBePrefix=new CanBePrefix();
+    private MustBeRefresh mustBeRefresh=new MustBeRefresh();
+    private InterestLifeTime interestLifeTime=new InterestLifeTime();
+    private Nonce nonce=new Nonce();
+    private HopLimit hopLimit=new HopLimit();
+    private Payload payload=new Payload();
+    private CongestionMark congestionMark=new CongestionMark();
+    private TTL ttl=new TTL();
+    private NackHeader nackHeader=new NackHeader();
+
+    private Identifier name=new Identifier();
 
     /**
      * 获取内容兴趣包的名字
@@ -72,7 +76,6 @@ public class Interest implements InteractWithField, IEncodingAble {
      */
     public boolean matchesName(Identifier identifier) {
         throw new Error("implement me");
-//        return identifier.toUri().equals(this.name.toUri());
     }
 
     /**
@@ -83,7 +86,6 @@ public class Interest implements InteractWithField, IEncodingAble {
      */
     public boolean matchesData(Data data) {
         throw new Error("implement me");
-//        return data.toUri().equals(this.)
     }
 
     /**
@@ -128,6 +130,13 @@ public class Interest implements InteractWithField, IEncodingAble {
             this.minPacket.mutableField.mutableProtectField.addBlock(block);
 
             // 填充可变非受保护区（无）
+            this.minPacket.mutableField.mutableDangerousField.clearBlocks();
+            // ttl
+            block = new SelfEncodingBase().selfWireEncode(this.ttl);
+            if (block == null) {
+                return false;
+            }
+            this.minPacket.mutableField.mutableDangerousField.addBlock(block);
 
             /////////////////////////////////////////////////////////////
             //// 填充只读区
@@ -183,6 +192,15 @@ public class Interest implements InteractWithField, IEncodingAble {
                 this.minPacket.readOnlyField.addBlock(block);
             }
 
+            // NackHeader
+            if(this.nackHeader.isInitial()){
+                block = new SelfEncodingBase().selfWireEncode(this.nackHeader);
+                if (block == null) {
+                    return false;
+                }
+                this.minPacket.readOnlyField.addBlock(block);
+            }
+
             // Payload
             block = new SelfEncodingBase().selfWireEncode(this.payload);
             if (block == null) {
@@ -201,7 +219,6 @@ public class Interest implements InteractWithField, IEncodingAble {
             }
             this.minPacket.identifierField.addIdentifier(identifierWrapper);
 
-
             return true;
         } catch (EncoderException | BlockException | ComponentException e) {
             throw new PacketException("Interest.fillDataToFields: " + e.getMessage());
@@ -223,17 +240,22 @@ public class Interest implements InteractWithField, IEncodingAble {
             //                     [CongestionMark]
             //                 }
             //                 {                         => 非受保护区
-            //                     "Empty"
+            //                     [TTL]
             //                 }
             //             }
             /////////////////////////////////////////////////////////////
-
             Block block = this.minPacket.mutableField.mutableProtectField.getBlockByType(new VlInt(TLV.TlvCongestionMark));
             if (block != null) {
                 if (!this.congestionMark.wireDecode(block)) {
                     return false;
                 }
             }
+            block=this.minPacket.mutableField.mutableDangerousField.getBlockByType(new VlInt(TLV.TlvTTL));
+            if (block != null) {
+                if (!this.ttl.wireDecode(block)) {
+                    return false;
+                }
+            }
 
             /////////////////////////////////////////////////////////////
             //// 解析只读区
@@ -249,8 +271,7 @@ public class Interest implements InteractWithField, IEncodingAble {
             ElementContainer elementContainer = this.minPacket.readOnlyField.getBlocks();
             int len = elementContainer.length();
             for (int i = 0; i < len; i++) {
-                Block newblock = null;
-                newblock = elementContainer.getBlock(i);
+                Block newblock = elementContainer.getBlock(i);
                 int type;
                 type = newblock.getType().getVlIntValue2Int();
                 switch (type) {
@@ -279,6 +300,11 @@ public class Interest implements InteractWithField, IEncodingAble {
                             return false;
                         }
                         break;
+                    case TLV.TlvNackHeader:
+                        if(!this.nackHeader.wireDecode(newblock)){
+                            return false;
+                        }
+                        break;
                     case TLV.TlvPayload:
                         if (!this.payload.wireDecode(newblock)) {
                             return false;
diff --git a/src/main/java/packet/LpPacket.java b/src/main/java/packet/LpPacket.java
new file mode 100644
index 0000000..6b4ac63
--- /dev/null
+++ b/src/main/java/packet/LpPacket.java
@@ -0,0 +1,11 @@
+package packet;
+
+/*
+ * @Author: Wang Feng
+ * @Description:
+ * @Version: 1.0.0
+ * @Date: 17:33 2021/4/2
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class LpPacket {
+}
diff --git a/src/main/java/packet/MINPacket.java b/src/main/java/packet/MINPacket.java
index 958b98d..7753f2d 100644
--- a/src/main/java/packet/MINPacket.java
+++ b/src/main/java/packet/MINPacket.java
@@ -10,12 +10,12 @@ import encoding.*;
  * @Date: 22:07 2021/3/13
  * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
  */
-public class MINPacket implements IEncodingAble {
-    public IdentifierField identifierField; // 标识区
-    private SignatureField signatureField;   // 签名区
-    public ReadOnlyField readOnlyField;     // 只读区
-    public MutableField mutableField;       // 可变区
-    public VlInt packetType; // 包类型
+public class MINPacket implements IEncodingAble,IMINPacket {
+    public IdentifierField identifierField=new IdentifierField();  // 标识区
+    public SignatureField signatureField=new SignatureField();     // 签名区
+    public ReadOnlyField readOnlyField=new ReadOnlyField();        // 只读区
+    public MutableField mutableField=new MutableField();           // 可变区
+    public VlInt packetType=new VlInt(TLV.TlvInvalid);             // 包类型
 
     /**
      * 判断 MIN 包是否是一个有效的包
@@ -44,8 +44,7 @@ public class MINPacket implements IEncodingAble {
             // 编码 TLV-VALUE
 
             // 可变区
-            int tmplen = 0;
-            tmplen = this.mutableField.wireEncode(encoder);
+            int tmplen = this.mutableField.wireEncode(encoder);
             if (tmplen <= 0) {
                 return -1;
             }
@@ -81,7 +80,6 @@ public class MINPacket implements IEncodingAble {
 
             // 编码包 TLV-TYPE
             tmplen = encoder.prependVarNumber(this.packetType);
-
             if (tmplen <= 0) {
                 return -1;
             }
@@ -122,14 +120,8 @@ public class MINPacket implements IEncodingAble {
             // 解析四个标识区
             int elementSize = block.getSubElements().length();
             for (int i = 0; i < elementSize; i++) {
-                Block cacheBlock = null;
-                try {
-                    cacheBlock = block.getSubElements().getBlock(i);
-                } catch (BlockException e) {
-                    throw new Error("MINPacket.wireDecode: " + e.getMessage());
-                }
-                int judgeType = 0;
-                judgeType = cacheBlock.getType().getVlIntValue2Int();
+                Block cacheBlock = block.getSubElements().getBlock(i);
+                int judgeType = cacheBlock.getType().getVlIntValue2Int();
                 switch (judgeType) {
                     case TLV.TlvIdentifierField: // 目的标识区
                         // 解析标识区，保证其中至少存在一个标识
diff --git a/src/main/java/packet/Nack.java b/src/main/java/packet/Nack.java
new file mode 100644
index 0000000..5463e6c
--- /dev/null
+++ b/src/main/java/packet/Nack.java
@@ -0,0 +1,11 @@
+package packet;
+
+/*
+ * @Author: Wang Feng
+ * @Description:
+ * @Version: 1.0.0
+ * @Date: 17:34 2021/4/2
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class Nack {
+}
diff --git a/src/main/java/security/KeyChain.java b/src/main/java/security/KeyChain.java
index b20c04f..4b6a7f9 100644
--- a/src/main/java/security/KeyChain.java
+++ b/src/main/java/security/KeyChain.java
@@ -2,8 +2,6 @@ package security;
 
 import minsecurity.identity.Identity;
 import minsecurity.identity.IdentityException;
-import org.checkerframework.checker.units.qual.K;
-
 /*
  * @Author: hongyu guo
  * @Description: 用于给网络包签名和验签
@@ -80,6 +78,7 @@ public class KeyChain {
         }
     }
 
+
     // TODO: packet类暂未完成
     // public void getIdentifierAndReadOnlyValueFromPacket(){
     //
diff --git a/src/test/java/packet/MINPacketTest.java b/src/test/java/packet/MINPacketTest.java
new file mode 100644
index 0000000..25e7268
--- /dev/null
+++ b/src/test/java/packet/MINPacketTest.java
@@ -0,0 +1,12 @@
+package packet;
+
+/*
+ * @Author: Wang Feng
+ * @Description:
+ * @Version: 1.0.0
+ * @Date: 11:17 2021/4/2
+ * @Copyright: MIN-Group；国家重大科技基础设施——未来网络北大实验室；深圳市信息论与未来网络重点实验室
+ */
+public class MINPacketTest {
+
+}