Based on finite difference method, the settlement behavior of subsoil under the action of architectural complex was analyzed using FDM (finite difference method) software FLAC-3D. It is show that the settlement behavior of subsoil under different construction model can be simulated by finite difference numerical software FLAC-3D. The influence depth of architectural complex is much more than single building. The factor that the compression modulus increases with depth increasing should be considered, when the thickness of soil is large. The distribution of settlement is similar with additional stress under the action of architectural complex. The subsoil settlement of one-by-one construction is a little bigger than whole construction, whose mechanism need further study.