The Discontinuous Deformation Analysis （ DDA ） method has shown much convenience in reflecting the deformation characters while Discontinuous Finite Element Method （DFEM） can more delicately reflect the tectonic plates interaction. In view of advantages of both DDA method and DFEM, firstly, we analyze the behave of the tectonic blocks in Chinese mainland by DDA method and obtained the boundary condition from measured movement from data of 308 GPS stations. Then based on the boundary condition we make a two-dimension DEFM model and used it to evaluate how the slipping along Altyn Tagh fault effects the tectonic deformation and stress filed in Chinese mainland.