Aimed at the structure of optical aspheric surface detection platform, this paper presented an error compensation model. A laser interferometer was use d to detect the three-axis position error and the linearity error, by least squ a re fitting the polynomial coefficients in the error curve, so the superposition error compensation was realized. The vertical errors of the three movement axes were measured, and then the coordinate rotation was made to realize the error co mpe nsation. The error analysis and testing techniques were used to complete the non- real-time error compensation. The results of a standard ball experiment show th a t the accuracy of aspherical surface detection platform is improved using error compensation.