diff --git a/rpc/gogopbprocessor.go b/rpc/gogopbprocessor.go
index 9df0dd5..d3c9b21 100644
--- a/rpc/gogopbprocessor.go
+++ b/rpc/gogopbprocessor.go
@@ -41,7 +41,10 @@ func (slf *GoGoPBProcessor) Marshal(v interface{}) ([]byte, error){
 }
 
 func (slf *GoGoPBProcessor) Unmarshal(data []byte, msg interface{}) error{
-	protoMsg := msg.(proto.Message)
+	protoMsg,ok := msg.(proto.Message)
+	if ok == false {
+		return fmt.Errorf("%+v is not of proto.Message type",msg)
+	}
 	return proto.Unmarshal(data, protoMsg)
 }
 
diff --git a/rpc/server.go b/rpc/server.go
index a268956..52e7524 100644
--- a/rpc/server.go
+++ b/rpc/server.go
@@ -147,7 +147,6 @@ func (agent *RpcAgent) Run() {
 				ReleaseRpcRequest(req)
 				continue
 			} else {
-				//will close tcpconn
 				ReleaseRpcRequest(req)
 				break
 			}
@@ -303,21 +302,22 @@ func (server *Server) selfNodeRpcHandlerGo(processor IRpcProcessor, client *Clie
 			if reply != nil && Returns != reply && Returns != nil {
 				byteReturns, err := req.rpcProcessor.Marshal(Returns)
 				if err != nil {
-					log.SError("returns data cannot be marshal ", callSeq)
-					ReleaseRpcRequest(req)
-				}
-
-				err = req.rpcProcessor.Unmarshal(byteReturns, reply)
-				if err != nil {
-					log.SError("returns data cannot be Unmarshal ", callSeq)
-					ReleaseRpcRequest(req)
+					Err = ConvertError(err)
+					log.SError("returns data cannot be marshal,callSeq is ", callSeq," error is ",err.Error())
+				}else{
+					err = req.rpcProcessor.Unmarshal(byteReturns, reply)
+					if err != nil {
+						Err = ConvertError(err)
+						log.SError("returns data cannot be Unmarshal,callSeq is ", callSeq," error is ",err.Error())
+					}
 				}
 			}
 
+			ReleaseRpcRequest(req)
 			v := client.RemovePending(callSeq)
 			if v == nil {
 				log.SError("rpcClient cannot find seq ",callSeq, " in pending")
-				ReleaseRpcRequest(req)
+
 				return
 			}
 			if len(Err) == 0 {
@@ -326,7 +326,6 @@ func (server *Server) selfNodeRpcHandlerGo(processor IRpcProcessor, client *Clie
 				v.Err = Err
 			}
 			v.done <- v
-			ReleaseRpcRequest(req)
 		}
 	}