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In order to analyze the accuracy of the BDS broadcast ephemeris, the laser ranging and precise ephemeris are used as the reference to do some analysis. Since there is no BDS-3 experimental satellite precise ephemeris, this paper designs the DBS-3 experimental satellite precise orbit determination experiment with a 3-day arc, and the results show that the orbit and clock offsets accuracies are about 50cm and 2ns respectively. Then combined with the BDS-2 post precision satellites ephemeris obtained from the international GNSS monitoring & assessment system (iGMAS), to evaluate the accuracy of the BDS-3/BDS-2 ephemeris-clock and ephemeris-orbit, in order to evaluate the ephemeris-orbit more accurately, the SLR observation data is used as an external means to evaluate the BDS satellite ephemeris-orbit accuracy, the Id RMS of the ephemeris-orbit and the STD of ephemeris-clock are counted, and the results show that most clock accuracies are better than 10 ns, the orbit accuracy is better than 5 m. In addition, in order to analyze the time-frequency performance of the ephemeris-clock, the frequency stability, the drift rate and the accuracy of the satellite clock offset are calculated. The experimental results show that the performance of the BDS-3 test satellites is generally better than that of the BDS-2. The performance indicators of the frequency accuracy, frequency drift rate and frequency stability calculated show that the BDS-3 satellite increases by 42.8% , 22.5% and 9.5% compared with the BDS-2. [ABSTRACT FROM AUTHOR]