The gravity dam supported by self weight for maintaining its steadiness is a kind of darning building , which is used as a kind of dam type most early, that has the history of 5 000 years approximately.

• 重力坝是依靠自身重量维持稳定的一种挡水建筑物,是人类最早使用的水坝坝型之一,约有5000年的历史。