diff --git a/lsa/ILsa.go b/lsa/ILsa.go
index 0565c0d..ac1e709 100644
--- a/lsa/ILsa.go
+++ b/lsa/ILsa.go
@@ -8,5 +8,21 @@
 
 package lsa
 
+import (
+	"minlib/component"
+	"minlib/encoding"
+)
+
 type ILsa interface {
+	GetSeqNo() uint64
+	SetSeqNo(seq uint64)
+
+	GetOriginRouter() *component.Identifier
+	SetOriginRouter(routerIdentifier *component.Identifier)
+
+	GetExpirationTime() uint64
+	SetExpirationTime(time uint64)
+
+	WireEncode(encoder *encoding.Encoder) (int,error)
+	WireDecode(block *encoding.Block) error
 }
diff --git a/lsdb/Lsdb.go b/lsdb/Lsdb.go
index fd96afc..67668da 100644
--- a/lsdb/Lsdb.go
+++ b/lsdb/Lsdb.go
@@ -114,17 +114,17 @@ func (l *Lsdb) ProcessGPPkt(pkt *packet.GPPkt)  {
 //  @return bool
 //
 func (l *Lsdb) GetIsBuildAdjLsaScheduled() bool {
-	panic("")
+	return l.isBuildAdjLsaScheduled
 }
 
 //
 //  GetSync
-//  @Description: 获取Sync协议类型
+//  @Description: 获取Sync协议逻辑处理器
 //  @receiver l
 //  @return communication.SyncLogicHandler
 //
-func (l *Lsdb) GetSync() communication.SyncLogicHandler {
-	panic("")
+func (l *Lsdb) GetSync() *communication.SyncLogicHandler {
+	return l.sync
 }
 
 //
@@ -133,15 +133,29 @@ func (l *Lsdb) GetSync() communication.SyncLogicHandler {
 //  @receiver l*
 //  @param routerIdentifier
 //  @param lsaType
-//  @return []*lsa.ILsa
+//  @return *lsa.ILsa
 //
-func (l* Lsdb) FindLsa(routerIdentifier *component.Identifier,
-	lsaType lsa.LsaType) []*lsa.ILsa {
+func (l *Lsdb) FindLsa(routerIdentifier *component.Identifier,
+	lsaType lsa.LsaType) lsa.ILsa {
 	panic("")
 }
 
-func (l *Lsdb) IsLsaNew() bool {
-	return false
+//
+//  IsLsaNew
+//  @Description: 返回来自某个路由器的seq是否表示新的LSA。
+//  @receiver l
+//  @param routerIdentifier
+//  @param lsaType
+//  @param seqNo
+//  @return bool
+//
+func (l *Lsdb) IsLsaNew(routerIdentifier *component.Identifier,
+	lsaType lsa.LsaType,seqNo uint64) bool {
+	lsa := l.FindLsa(routerIdentifier,lsaType)
+	if lsa.GetSeqNo() >= seqNo{
+		return false
+	}
+	return true
 }
 
 func (l *Lsdb) InstallLsa(lsa *lsa.ILsa)  {