紫禁城的庭院和街道旁，大小不等的铜缸、铁缸几乎是永恒不变的陈设。故宫原来一共有308 口铜铁质地的大缸，其中鎏金铜缸22 口。这些大缸的作用有多重意义，首先它是储水防火的消防设备。紫禁城建筑大多是以木结构为主，怕火灾的发生。在高大的宫殿旁边放置贮满水的大缸，用以防备突发的火情。朝廷对这些大铜缸非常重视，每年入冬之后，皇帝还要下旨令人在缸盖上加屉子并苫草帘，下面置放炭火防 止结冰。

Beside the courtyard and streets of the Forbidden City, bronze and iron tanks of different sizes are almost permanent furnishings. The palace museum used to have 308 large jars made of copper and iron, 22 of which were made of gilded copper. The functions of these large tanks have multiple meanings. First, they are fire-fighting equipment for water storage and fire prevention. Most of the buildings in the Forbidden City are made of wood, so they are afraid of fire. A large tank full of water was placed next to the tall palace in case of fire. The imperial court attached great importance to these large copper tanks. Every winter, the emperor also ordered people to add drawers and straw curtains on the cylinder head, and put charcoal fire under them to prevent freezing.

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