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[Abstract] In the range test, the traditional single reference station has limited its range due to the limitation of the baseline length, and the difference accuracy is obviously affected by the decrease of the atmospheric error after a certain distance. In order to solve the problem that the GPS single frequency pseudorange differential positioning accuracy decreased resulted from far distance, a multi-base station GPS positioning pseudorange differential location method is proposed. This method analyzes the relationship between pseudorange equation and pseudorange differential location in depth; establishes a range base station to receive real-time target data and base station positioning data and transmits it to the control center. In order to solve the target location information in real time, this method designs multi-base station data processing algorithm and multi-baseline measurement data weighted processing method, which uses distance difference based linearity difference model. The test results show that the multi-base station GPS positioning pseudorange differential positioning method can effectively solve the problem that the precision of single-base pseudorange differential positioning decreases with the increase of the distance between the subscriber station and the base station, and improves the test precision.