diff --git a/Plugins/WPSCombatSystem/combat_service.py b/Plugins/WPSCombatSystem/combat_service.py
index fdeb4e7..3ba690d 100644
--- a/Plugins/WPSCombatSystem/combat_service.py
+++ b/Plugins/WPSCombatSystem/combat_service.py
@@ -85,6 +85,13 @@ class CombatService:
             (item_id, user_id)
         )
         self._db.conn.commit()
+
+        # 6. 扣除装备物品
+        backpack.set_item_quantity(user_id, item_id, backpack.add_item(user_id, item_id, 0) - 1)
+
+        # 7. 恢复被卸下的装备
+        if old_equipped:
+            backpack.add_item(user_id, old_equipped, 1)
         
         result_msg = f"✅ 已装备 {equipment.name}"
         if old_equipped and old_equipped != item_id:
@@ -131,6 +138,10 @@ class CombatService:
             (user_id,)
         )
         self._db.conn.commit()
+
+        # 8. 恢复被卸下的装备
+        backpack: WPSBackpackSystem = Architecture.Get(WPSBackpackSystem)
+        backpack.add_item(user_id, old_item_id, 1)
         
         return True, f"✅ 已卸下 {old_name}"