Abstract: In this paper, accrding to the elastic dislocation theory and the inversion method of the fault movement parameters with prior information, the design of GPS monitoring points in a fault area and its impact on the results of the inversion of the fault movement parameters are investigated by the numerical test, and the effect of detecting the fault movement for GPS points is tested. The impact of the random error and the gross error in the GPS points on detecting the fault activies are discussed.