diff --git a/src/main/java/component/SignatureType.java b/src/main/java/component/SignatureType.java
index c141ca3..dfc68c3 100644
--- a/src/main/java/component/SignatureType.java
+++ b/src/main/java/component/SignatureType.java
@@ -108,43 +108,35 @@ public class SignatureType implements TlvComponentBase, IEncodingAble {
      */
     @Override
     public int wireEncode(Encoder encoder) throws ComponentException {
-        int totalLength=0;
-
-        // 编码 TLV-VALUE
-        int tmplen= 0;
         try {
-            tmplen = encoder.prependNonNegativeInteger(this.value.getSignatureAlgorithm());
+            int totalLength = 0;
+
+            // 编码 TLV-VALUE
+            int tmplen = encoder.prependNonNegativeInteger(this.value.getSignatureAlgorithm());
+            if (tmplen <= 0) {
+                return -1;
+            }
+            totalLength += tmplen;
+
+            // 编码 TLV-LENGTH
+            tmplen = encoder.prependVarNumber(new VlInt(totalLength));
+            if (tmplen <= 0) {
+                return -1;
+            }
+            totalLength += tmplen;
+
+            // 编码 TLV-TYPE
+            tmplen = encoder.prependVarNumber(new VlInt(TLV.TlvSignatureType));
+
+            if (tmplen <= 0) {
+                return -1;
+            }
+            totalLength += tmplen;
+
+            return totalLength;
         } catch (EncoderException e) {
             throw new ComponentException("SignatureType.wireEncode: "+e.getMessage());
         }
-        if(tmplen<=0){
-            return -1;
-        }
-        totalLength+=tmplen;
-
-        // 编码 TLV-LENGTH
-        try {
-            tmplen=encoder.prependVarNumber(new VlInt(totalLength));
-        } catch (EncoderException e) {
-            throw new ComponentException("SignatureType.wireEncode: "+e.getMessage());
-        }
-        if(tmplen<=0){
-            return -1;
-        }
-        totalLength+=tmplen;
-
-        // 编码 TLV-TYPE
-        try {
-            tmplen=encoder.prependVarNumber(new VlInt(TLV.TlvSignatureType));
-        } catch (EncoderException e) {
-            throw new ComponentException("SignatureType.wireEncode: "+e.getMessage());
-        }
-        if(tmplen<=0){
-            return -1;
-        }
-        totalLength+=tmplen;
-
-        return totalLength;
     }
 
     /**
@@ -154,23 +146,22 @@ public class SignatureType implements TlvComponentBase, IEncodingAble {
      */
     @Override
     public boolean wireDecode(Block block) throws ComponentException {
-        // 检查 Type 是否正确
-        if(!TLV.expectType(block.getType(),new VlInt(TLV.TlvSignatureType))){
-            return false;
-        }
-
-        // 尝试从 TLE-VALUE 中读取出一个非负整数
-        long result= 0;
         try {
-            result = TLV.readNonNegativeInteger(block.getValue(),0,block.getLength().getVlIntValue2Int());
+            // 检查 Type 是否正确
+            if (!TLV.expectType(block.getType(), new VlInt(TLV.TlvSignatureType))) {
+                return false;
+            }
+
+            // 尝试从 TLE-VALUE 中读取出一个非负整数
+            long result = TLV.readNonNegativeInteger(block.getValue(), 0, block.getLength().getVlIntValue2Int());
+            if (result < 0) {
+                return false;
+            }
+            this.value = new SignatureAlgorithm((int) result);
+
+            return true;
         } catch (TLVException | VlIntException e) {
             throw new ComponentException("SignatureType.wireDecode: " + e.getMessage());
         }
-        if(result<0){
-            return false;
-        }
-        this.value=new SignatureAlgorithm((int)result);
-
-        return true;
     }
 }
diff --git a/src/test/java/component/SignatureTypeTest.java b/src/test/java/component/SignatureTypeTest.java
new file mode 100644
index 0000000..f835bc0
--- /dev/null
+++ b/src/test/java/component/SignatureTypeTest.java
@@ -0,0 +1,76 @@
+package component;
+
+import encoding.*;
+import org.junit.Test;
+import packet.PacketException;
+
+import java.util.Arrays;
+
+import static org.junit.Assert.assertEquals;
+
+/*
+ * @Author: Wang Feng
+ * @Description:
+ * @Version: 1.0.0
+ * @Date: 10:48 2021/3/31
+ * @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 SignatureTypeTest {
+    @Test
+    public void TestCreateSignatureTypeByBlock() throws EncoderException, ComponentException, BlockException {
+        Encoder encoder=new Encoder();
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        String str="/min/pkusz";
+        IdentifierWrapper got=new IdentifierWrapper().createCommonIdentifierByString(str);
+        System.out.println("type: "+got.getTlvType().toString());
+        got.wireEncode(encoder);
+        byte[] rawBuf=encoder.getBuffer();
+        System.out.println("buf: "+ Arrays.toString(rawBuf));
+        byte[] buf2=new byte[4];
+        System.arraycopy(rawBuf,14,buf2,0,4);
+        Block block=new Block(new VlInt(202),new VlInt(4),buf2,true);
+        System.out.println("block length: "+block.getLength());
+        SignatureType gotContent=new SignatureType(block);
+        System.out.println("sigtype: "+gotContent.getValue().getSignatureAlgorithm());
+    }
+
+    @Test
+    public void TestCreateSignatureTypeByValue() throws PacketException, EncoderException, BlockException, ComponentException {
+        SignatureAlgorithm value=new SignatureAlgorithm(0);
+        SignatureType got=new SignatureType(value);
+        System.out.println(got.getValue().getSignatureAlgorithm());
+        Block rawBlock=new SelfEncodingBase().selfWireEncode(got);
+        System.out.println(rawBlock.getType()+" "+rawBlock.getLength()+" "+Arrays.toString(rawBlock.getValue()));
+    }
+
+    @Test
+    public void TestSignatureType_WireEncode() throws PacketException, EncoderException, BlockException, ComponentException {
+        SignatureAlgorithm value=new SignatureAlgorithm(0);
+        SignatureType got=new SignatureType(value);
+        System.out.println(got.getValue().getSignatureAlgorithm());
+        Block rawBlock=new SelfEncodingBase().selfWireEncode(got);
+        System.out.println(rawBlock.getType()+" "+rawBlock.getLength()+" "+Arrays.toString(rawBlock.getValue()));
+        Encoder encoder=new Encoder();
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        got.wireEncode(encoder);
+        byte[] gotBuf=encoder.getBuffer();
+        System.out.println(Arrays.toString(gotBuf));
+    }
+
+    @Test
+    public void TestCreateSignatureTypeByValue2() throws PacketException, EncoderException, BlockException, ComponentException {
+        SignatureAlgorithm value=new SignatureAlgorithm(0);
+        SignatureType got=new SignatureType(value);
+        System.out.println(got.getValue().getSignatureAlgorithm());
+        Block rawBlock=new SelfEncodingBase().selfWireEncode(got);
+        System.out.println(rawBlock.getType()+" "+rawBlock.getLength()+" "+Arrays.toString(rawBlock.getValue()));
+        Encoder encoder=new Encoder();
+        encoder.encoderReset(new SizeT(Encoder.MaxPacketSize),new SizeT(0));
+        got.wireEncode(encoder);
+        byte[] gotBuf=encoder.getBuffer();
+        System.out.println(Arrays.toString(gotBuf));
+        SignatureType newSig=new SignatureType();
+        newSig.wireDecode(rawBlock);
+        System.out.println(newSig.getValue().getSignatureAlgorithm());
+    }
+}