diff --git a/server/gameserver/airraid.cc b/server/gameserver/airraid.cc
index 1d794a43..6dc2529f 100644
--- a/server/gameserver/airraid.cc
+++ b/server/gameserver/airraid.cc
@@ -51,44 +51,7 @@ void AirRaid::Exec(int airraid_id)
             if (room_->IsGameOver()) {
                 return;
             }
-            for (auto& tuple : raid_meta->_raid_waves) {
-                int num = std::get<0>(tuple);
-                int delay = std::get<1>(tuple);
-                glm::vec3 born_pos = center;
-
-                auto bomb_cb =
-                    [this, raid_meta, num, delay, born_pos]
-                    (int event, const a8::Args* args)
-                    {
-                        if (a8::TIMER_EXEC_EVENT == event) {
-                            if (room_->IsGameOver()) {
-                                return;
-                            }
-                            glm::vec3 dir = GlmHelper::UP;
-                            GlmHelper::RotateY(dir, a8::RandAngle());
-                            glm::vec3 pos = born_pos +  dir * (50.0f + rand() % 100);
-                            if (room_->grid_service->CanAdd(pos.x, pos.y)) {
-                                for (auto bomb_id : raid_meta->_bomb_ids) {
-                                    RoomObstacle* obstacle = room_->CreateObstacle
-                                        (
-                                         bomb_id,
-                                         pos.x,
-                                         pos.y,
-                                         pos.z
-                                         );
-                                    obstacle->Active();
-                                }
-                            }
-                        }
-                    };
-
-                for (int i = 0; i < num; ++i) {
-                    room_->xtimer.SetTimeoutEx
-                        (delay / FRAME_RATE_MS,
-                         bomb_cb,
-                         &room_->xtimer_attacher_);
-                }
-            }
+            ExecOneRoundAirRaid(raid_meta, center);
         };
 
     room_->xtimer.SetTimeoutEx
@@ -124,3 +87,45 @@ bool AirRaid::GenAirRaidPos(const mt::AirRaid* raid_meta, glm::vec3& center)
     }
     room_->frame_event.AddAirRaid(raid_meta->appear_time(), center, raid_meta->rad());
 }
+
+void AirRaid::ExecOneRoundAirRaid(const mt::AirRaid* raid_meta, const glm::vec3& pos)
+{
+    for (auto& tuple : raid_meta->_raid_waves) {
+        int num = std::get<0>(tuple);
+        int delay = std::get<1>(tuple);
+        glm::vec3 born_pos = pos;
+
+        auto bomb_cb =
+            [this, raid_meta, num, delay, born_pos]
+            (int event, const a8::Args* args)
+            {
+                if (a8::TIMER_EXEC_EVENT == event) {
+                    if (room_->IsGameOver()) {
+                        return;
+                    }
+                    glm::vec3 dir = GlmHelper::UP;
+                    GlmHelper::RotateY(dir, a8::RandAngle());
+                    glm::vec3 pos = born_pos +  dir * (50.0f + rand() % 100);
+                    if (room_->grid_service->CanAdd(pos.x, pos.y)) {
+                        for (auto bomb_id : raid_meta->_bomb_ids) {
+                            RoomObstacle* obstacle = room_->CreateObstacle
+                                (
+                                 bomb_id,
+                                 pos.x,
+                                 pos.y,
+                                 pos.z
+                                 );
+                            obstacle->Active();
+                        }
+                    }
+                }
+            };
+
+        for (int i = 0; i < num; ++i) {
+            room_->xtimer.SetTimeoutEx
+                (delay / FRAME_RATE_MS,
+                 bomb_cb,
+                 &room_->xtimer_attacher_);
+        }
+    }
+}
diff --git a/server/gameserver/airraid.h b/server/gameserver/airraid.h
index 0d38356b..df9211e3 100644
--- a/server/gameserver/airraid.h
+++ b/server/gameserver/airraid.h
@@ -13,6 +13,7 @@ class AirRaid
 
     void Exec(int airraid_id);
     bool GenAirRaidPos(const mt::AirRaid* raid_meta, glm::vec3& center);
+    void ExecOneRoundAirRaid(const mt::AirRaid* raid_meta, const glm::vec3& pos);
 
  private:
     Room* room_ = nullptr;