In order to make data communicate mutully between optical software and FEA software,data processing and transformation algorithm between optical and mechanical analyses were given in optical-mechanical system. Zernike polynomials were used as interface tools. On the basis of the study on Zernike fitting process, a visual optical-mechanical interface process was developed. All functions in the program were explained. A reflect mirror in the telescope was taken as example. The optical/mechanical analysis was made at last. The results proved the effective and extensive performance of the interface program.