The traditional method of fast selection satellite based on elevation is mainly focusing on the research of single point positioning accuracy, and the influence of satellite elevation on position accuracy directed on differential positioning is studied. To verify whether the introduction of low elevation satellites by the differential station affects the accuracy of the self-closing-loop pseudo-range differential positioning results on the three frequency points of the differential station reference receiver, the index number of low elevation satellite time-segment (below 12 degrees) is filtered out, then according to the time index, the self-closing-loop differential positioning results for the three frequency points (GPS L1、BD B1、BD B3) of the reference receiver in sequence is statistic, then the pseudo-range differential positioning results of high elevation satellite time-segment based on the elevation angle of the rapid star selection is compared and analyzed. The experimental results show that differential positioning based on the elevation angle of the rapid star selection can improve the positioning accuracy to a certain extent.