This paper investigates the accuracy of BDS3 PPP-B2b corrections,the service scope,and the performance of precise point positioning (PPP).The results show that PPP-B2b improves the broadcast orbit by 4.3%,6.2% and 16.1% in radial,cross-track and along-track directions respectively;while the satellite clock errors are decreased by 81.8%,showing a standard deviation of 0.22 ns.In terms of service coverage,the availability of PPP-B2b service reaches more than 80% in China and more than 70% in the whole Asian area.In terms of positioning performance,the use of PPP-B2b signal for PPP solution reaches centimeter level for static PPP solution,and decimeter level for kinematic PPP solution with average convergence time of 22.9 min.