diff --git a/src/MultiPlayer/multiplaymgr.cxx b/src/MultiPlayer/multiplaymgr.cxx
index c9c8a8e..b46bd47 100644
--- a/src/MultiPlayer/multiplaymgr.cxx
+++ b/src/MultiPlayer/multiplaymgr.cxx
@@ -1438,7 +1438,7 @@ FGMultiplayMgr::SendMyPosition(const FGExternalMotionData& motionInfo)
 
         //zhongjin
 
-        std::string mAirportid = fgGetString("/instrumentation/comm/airport-id");
+        std::string mAirportid = fgGetString("/sim/airport/nearest-tower-ident");   //塔台
         strncpy(PosMsg->airport, mAirportid.c_str(), 4);
         //PosMsg->airport[4 - 1] = '\0';
 
@@ -1479,6 +1479,10 @@ FGMultiplayMgr::SendMyPosition(const FGExternalMotionData& motionInfo)
         xxx = fgGetDouble("/instrumentation/transponder/id-code",true);
         PosMsg->jwhtext[11] = XDR_encode_float (xxx);
         
+        xxx = fgGetDouble("/position/altitude-agl-m",true);
+        PosMsg->jwhtext[11] = XDR_encode_float (xxx);
+        
+
         //n = fgGetNode("");
 
       }