Aiming at the problem of insufficient performance evaluation of GLONASS spaceborne atomic clocks at present. Using GLONASS precision satellite clock error data from 2013 to 2017 provided by gfz. The phase, frequency, frequency drift, fitting residuals, fitting accuracy, frequency accuracy, 10,000-second stability and periodic characteristics of GLONASS spaceborne atomic clock are analyzed. The calculation results show that: The frequency drift of GLONASS is maintained at a magnitude of XX. The frequency accuracy is about XX, and the frequency stability is about XX. There are periodic terms in the satellite clock difference, and the main period and the second periodic are XX and XX. respectively.