Abstract: Multinomial fitting equations of experimental p–s curve of soil anchors were obtained with the method of the least squares,then according to the compatibility of deformation of the crossing point of soil anchors and earth-retaining pile wall,the nonlinear equations were proposed.Solving the above simultaneous equations,the horizontal displacement of the earth-retaining pile wall could be obtained.The optimum design of above problem was discussed where the maximum horizontal displacement of the earth-retaining pile wall was taken as the constraint condition,the interval of the soil anchors as variables and the minimum stiffness of the earth-retaining pile wall as the target function.In the end,an optimizing example was given.