Abstract: This paper based on the Gravity Retaining Wall sections of geometric characteristics to established mathematical model for optimal design,and then used finite element software ANSYS to realize the Cross-section optimal design of retaining wall,What's more,it cited engineering examples to prove this method.The comparisou of the optimal solution with the previous results basedon Matlab programming shows that the results are more inexpensive and reasonable.It also demonstrated that the ANSYS optimization design module has more feasibility and superiority in the geotechnical engineering optimal design,this method could provide new ideas for other similar geotechnical or structure engineering optimization.