diff --git a/server/gameserver/bullet.cc b/server/gameserver/bullet.cc
index 1b3e48b..0fb5964 100644
--- a/server/gameserver/bullet.cc
+++ b/server/gameserver/bullet.cc
@@ -142,6 +142,17 @@ void Bullet::ProcBomb()
             ProcMolotorCocktailBomb(delay_time);
         }
         break;
+    case IS_C4:
+        {
+            //c4
+            delay_time = gun_meta->i->missiles_time();
+            ProcC4Bomb(delay_time);
+        }
+        break;
+    default:
+        {
+        }
+        break;
     }
     room->RemoveObjectLater(this);
 }
@@ -191,7 +202,8 @@ bool Bullet::IsBomb()
         meta->i->_inventory_slot() == IS_FRAG ||
         meta->i->_inventory_slot() == IS_SMOKE ||
         meta->i->_inventory_slot() == IS_POSION_GAS_BOMB ||
-        meta->i->_inventory_slot() == IS_MOLOTOR_COCKTAIL;
+        meta->i->_inventory_slot() == IS_MOLOTOR_COCKTAIL ||
+        meta->i->_inventory_slot() == IS_C4;
 }
 
 void Bullet::MapServiceUpdate()
@@ -241,7 +253,13 @@ void Bullet::Check(float distance)
                  AabbCollider aabb_box;
                  c->GetHitAabbBox(aabb_box);
                  if (c != sender.Get() && !c->dead && TestCollision(room, &aabb_box)) {
-                     objects.insert(c);
+                     if (meta->i->_inventory_slot() == IS_C4) {
+                         if (!c->IsHuman()) {
+                             objects.insert(c);
+                         }
+                     } else {
+                         objects.insert(c);
+                     }
                  }
              }
          });
@@ -333,3 +351,32 @@ void Bullet::ProcMolotorCocktailBomb(int delay_time)
         sender.Get()->buff_vec2_param1 = old_buff_vec2_param1;
     }
 }
+
+void Bullet::ProcC4Bomb(int delay_time)
+{
+    if (sender.Get()) {
+        FragMiTask* task = new FragMiTask();
+        task->room = room;
+        task->sender.Attach(sender.Get());
+        task->bomb_pos = GetPos();
+        task->gun_meta = gun_meta;
+        task->meta = meta;
+        task->atk = GetAtk();
+        room->xtimer.AddDeadLineTimerAndAttach
+            (std::max(1, (int)(delay_time / FRAME_RATE_MS)),
+             a8::XParams()
+             .SetSender(task),
+             [] (const a8::XParams& param)
+             {
+                 FragMiTask* task = (FragMiTask*)param.sender.GetUserData();
+                 task->Done();
+             },
+             &task->timer_attacher.timer_list_,
+             [] (const a8::XParams& param)
+             {
+                 FragMiTask* task = (FragMiTask*)param.sender.GetUserData();
+                 delete task;
+             }
+             );
+    }
+}
diff --git a/server/gameserver/bullet.h b/server/gameserver/bullet.h
index b853bff..48a2a94 100644
--- a/server/gameserver/bullet.h
+++ b/server/gameserver/bullet.h
@@ -49,6 +49,7 @@ protected:
     void ProcFragBomb(int delay_time);
     void ProcPosionGasBomb(int delay_time);
     void ProcMolotorCocktailBomb(int delay_time);
+    void ProcC4Bomb(int delay_time);
     inline void MapServiceUpdate();
     void Check(float distance);