diff --git a/server/gameserver/room.cc b/server/gameserver/room.cc
index d21ce4b..590aae3 100644
--- a/server/gameserver/room.cc
+++ b/server/gameserver/room.cc
@@ -1305,20 +1305,22 @@ void Room::InitAirDrop()
 {
     std::list<MetaData::AirDrop>& air_drops = MetaMgr::Instance()->GetAirDrops();
     for (auto& air_drop : air_drops) {
-        xtimer.AddDeadLineTimerAndAttach(SERVER_FRAME_RATE * air_drop.i->time(),
-                                         a8::XParams()
-                                         .SetSender(this)
-                                         .SetParam1(air_drop.i->appear_time())
-                                         .SetParam2(air_drop.i->drop_id())
-                                         .SetParam3(air_drop.i->id()),
-                                         [] (const a8::XParams& param)
-                                         {
-                                             Room* room = (Room*)param.sender.GetUserData();
-                                             if (!room->IsGameOver()) {
-                                                 room->AirDrop(param.param1, param.param2);
-                                             }
-                                         },
-                                         &xtimer_attacher_.timer_list_);
+        if (air_drop.i->id() >= 1 && air_drop.i->id() <= 6) {
+            xtimer.AddDeadLineTimerAndAttach(SERVER_FRAME_RATE * air_drop.i->time(),
+                                             a8::XParams()
+                                             .SetSender(this)
+                                             .SetParam1(air_drop.i->appear_time())
+                                             .SetParam2(air_drop.i->drop_id())
+                                             .SetParam3(air_drop.i->id()),
+                                             [] (const a8::XParams& param)
+                                             {
+                                                 Room* room = (Room*)param.sender.GetUserData();
+                                                 if (!room->IsGameOver()) {
+                                                     room->AirDrop(param.param1, param.param2);
+                                                 }
+                                             },
+                                             &xtimer_attacher_.timer_list_);
+        }
     }
 }