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Based on PANDA software,GPS and Beidou observation data of four Beidou continuous operation tracking network (iGMAS / BETS / CMONOC / MGEX) are calculated in precise point positioning mode,while GPS and Beidou positioning accuracy and observation residuals of each tracking station are analyzed,which can provide reference for the establishment of centimeter-level reference coordinate frame using Beidou system.The results are as follows: single day positioning repeatability with Beidou are 11.06mm,7.33mm,30.13mm in E,N,U directions respectively; the STD of differences between GPS and Beidou are 11.36mm,7.43mm,31.73mm in E,N,U directions,which indicates that Beidou system can achieve centimeter-level precision positioning at service area; the average of differences between GPS and Beidou are 4.87mm,2.65mm,29.38mm in E,N,U directions,which demonstrates an obvious systematic bias of precision positioning between GPS and Beidou; according to tracking network,GPS and Beidou positioning accuracy and residuals are statistically analyzed,which shows that CMONOC tracking network has the best positioning accuracy,while MGEX and BETS tracking network are worse and iGMAS tracking network is much lower.