In order to further verify the correctness of pile unit model,comparing the results of settlement deformation,which is based on the finite element analysis software FLAG 3D,with the results of PLAXIS 3D and measurement data of settlement.At the same time,by comparing the operation process of FLAC 3D and PLAXIS 3D,there are some advantages and features about the two software that can provide a basis to select appropriate numerical analysis software for future engineering.