Abstract: Based on the IGS-MGEX observation data, the BeiDou-3 Navigation Satellite System (BDS-3) satellite uncalibrated phase delay (UPD) is estimated. In order to analyze the performance current BDS-3 constellation, both the float and fixed precise point positioning (PPP) are tested. The results show that the accuracy of BDS-3 PPP is roughly equivalent to that of GPS. The average root mean square (RMS) of BDS-3 float PPP solutions are 1.4 cm, 1.0 cm, and 1.6 cm for east (E), north (N), and up (U) direction, while the accuracy can be improved to 0.9 cm, 0.7 cm, and 1.4 cm respectively with ambiguity resolution.