Abstract: Against the shortcoming of the traditional GPS elevation anomaly calculation methods，used the GA-LSSVM to calculate the GPS elevation anomaly. The experiment shows that GA can select the suitable parameters of the LSSVM. In the case of limited sample，the GA-LSSVM model can overcome the disadvantage of the small sample，and obtaion the accurate results. By evaluating the accuracy of the results，the GA-LSSVM can be

Key words: extended to practical applications.GA, LSSVM, GPS elevation anomaly