diff --git a/server/gameserver/incubator.cc b/server/gameserver/incubator.cc
index d4a431fb..31605c29 100644
--- a/server/gameserver/incubator.cc
+++ b/server/gameserver/incubator.cc
@@ -363,7 +363,7 @@ void Incubator::SpawnWaveMon(int wave)
         for (int i = 0; i < content->enemys.size(); ++i) {
             room->xtimer.AddDeadLineTimerAndAttach
                 (
-                 i == 0 ? 0 : 1000 / FRAME_RATE_MS,
+                 i == 0 ? 0 : (1000 + room->pve_mode_meta->pb->wave_prepare_time() * 1000) / FRAME_RATE_MS,
                  a8::XParams()
                  .SetSender(this)
                  .SetParam1(content)