This paper analyzes 4 types of group-pile which contains 4 piles with spacing 1. 5D, 2D, 2. 5D and 3D(D is diameter of the bearing plate)by numerical analysis, and draws some conclusions. The main conclusions are; group pile effect of DX pile increases sharply when pile spacing decreases;the bearing capacity of 3D spacing group-pile is 1. 32 times larger than that of 1. 5D spacing group-pile; effect coefficient of group-pile increases from 0. 59 to 0.78 when spacing increases from 1. 5D to 3D; the maximum value of settlement of soil among group-pile occurs between two bearing plates, and it decreases when the spacing of pile increases.%通过数值计算对不同桩间距的DX桩群桩进行了分析研究.结果表明:DX桩的群桩效应随着桩间距的减小而逐渐明显,间距为6倍桩径的群桩极限承载力是间距为3倍桩径的群桩极限承载力的1.32倍；群桩间距由3倍桩径增大为6倍桩径时,群桩效应系数由0.59增大为0.78；群桩间土体沉降的最大值发生在两扩盘中间位置处,且随着桩间距的增大而减小.
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