As the accuracy of the broadcast ephemeris and clock difference parameters of the satellite navigation system increases, the pseudo-range measurement deviation of the downlink navigation signal is significant for the improvement of the user positioning timing accuracy. Due to the unique satellite constellation and system constitution, the Beidou-II satellites pseudo-range measurement exhibits a linear correlation with the elevation angle, and the amplitude is significantly higher than that of the GPS satellites, which is the key bottleneck for the service performance improvement of the Beidou-II. With the construction of the Beidou-III system, the space constellation is gradually dominated by MEO satellites. In this paper, the iGMAS public data is used to comprehensively evaluate the multipath deviation characteristics of the Beidou satellite downlink pseudo-range measurement. The results show that the pseudo-range multipath deviation of the Beidou-III satellites has been significantly improved with the elevation angle, the peak-to-peak value is ±1m, and the distribution is random, similar to GPS satellite features.