Based on the verified finite element parameters of a project，we carry out load tests with sleeve and under excavation of piles of slab in dock by the software of ABAQUS，and discuss the changes of the bearing load of pile due to the depth and radius of excavation，depth and location of support wall.Through this study，the basic knowledge of the effects of excavation on pile foundation of slab in dock are initially obtained ，which is of some referential significance for the improvement of theories for piled foundation design.