Taking a large special-shaped foundation pit precipitation design scheme in Shanghai for background, this paper discussed the overall design scheme of foundation pit dewatering, calculated the un-pressure integrity annular well point system displacement and pit dewatering deep well numbers, got the well point numbers of light well point precipitation, and in accordance with the actual conditions, researched the layout of deep well dewatering, provided guidance for future similar engineering construction.%以上海某特大异形基坑降水设计方案为背景-对基坑降水的总体设计方案展开了论述，计算了无压完整井环形井点系统排水量及坑内降水深井的数量，得到了轻型井点降水的井点数，并按照实际工况，对深井降水的布置进行了研究，对今后类似工程的施工提供了一定的参考与借鉴。
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