diff --git a/App/ToolsUI/Payload/Payload.cpp b/App/ToolsUI/Payload/Payload.cpp
index 5fdf7fd..48b306d 100644
--- a/App/ToolsUI/Payload/Payload.cpp
+++ b/App/ToolsUI/Payload/Payload.cpp
@@ -950,6 +950,7 @@ void Payload::setup_commands(void)
                                         //发到encap
 
                                         QByteArray rwr_encap;
+                                        rwr_encap.clear();
 
                                         for(int i = 0;i< 13;i++)
                                         {
@@ -1127,6 +1128,7 @@ void Payload::setup_commands(void)
                                         //发送到encap
 
                                         QByteArray uv_encap;
+                                        uv_encap.clear();
 
                                         for(int i = 0;i< 13;i++)
                                         {
diff --git a/MavLinkNode/datastream.cpp b/MavLinkNode/datastream.cpp
index 7b7ae86..ab8c63f 100644
--- a/MavLinkNode/datastream.cpp
+++ b/MavLinkNode/datastream.cpp
@@ -280,16 +280,19 @@ void DataStream::sendAFrame(void)
 
     size_t len = databuff.size();
 
-    if(len > 253)
-    {
-        len = 253;
-    }
-
     for(uint16_t i = 0;i < len;i++)
     {
         encapsulated_data.data[i] = (uint8_t)databuff[i];
     }
 
+    if(len < 253)
+    {
+        for(uint16_t i = len;i < 253;i++)
+        {
+            encapsulated_data.data[i] = 0;
+        }
+    }
+
     qDebug() << "send encap" << databuff;
 
     mavlink_msg_encapsulated_data_encode(GCS_SysID,GCS_CompID, &msg,&encapsulated_data);