Abstract: Considering construction steps,to every step,nonlinear equations are proposed according to the compatibility of deformation of the intersection point between soil anchors and earth-retaining pile wall.Multinomial fitting of P-s curve are figured out with the method of the least squares,then the nonlinear regression function is gained,which is put into the nonlinear equations and solved through fixed point iterative program.The force and displacement of every construction step can be obtained.By summation of the displacements of the same point for different construction steps,the eventual displacement can be got.