Pile foundation settlement induced by pit’s dewatering occurs as the result of coupling action of many factors. Current computational theory can not consider so many factors and research on this field is very little. For the problem,adapts finite difference program FLAC3D ,analy-sis on pile foundation settlement due to deep foundation dewatering is carried out. The vertical and horizontal displacement of different length piles are contrasted on the same dewatering condition. The results are useful for the similar future projects.%针对目前的计算理论很难考虑多因素耦合作用计算基坑降水引起的周围建筑桩基的沉降变形问题，采用大型有限差分程序 FLAC3D ，研究了基坑降水对周围建筑桩基础沉降变形的影响，对比了相同降水条件下，不同桩长的桩基沉降变形，得出了有益于以后工程实践的结论。
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