Abstract: Clock eror is a very important parameter information in GNSS application，including satelliteclock erroxr and receiver clock eor. lis aocuracy directly affects the service level of GNSS. Satellite clock-eror is usually calculated by using the observation data of global tracking stations ox ganized by GNss suchas IGS. In the process of calculation,chocsing a stable clock error reference can obtain mare accurate sat-ellite clock error , and then correctly reflect the performance of satellite clock and better model and foxecastsatellite clock emor.'The clock dfference benchmark usually selects the station with high-performance re-ceiver clock.'T'herefore , the perfomance analysis odf the receiver clock d IGS station is caied out.'T'hispoject evaluates the performance of the receiver clock df all IGS stations , mainly including the magnitudeof the clock difference and the shot-term and long-tem stability of the clock. 'The results show that : as awell-known GNSS service oxganization in the world，the clock emor magnitude of the receiver clock e-quipped with IGS station is mostly better than 1 x 10-’s，which take the propontion of about 58.0% , andthe clock eor magnitude of 74 stations is ns ; the shoart-term and long-term stability of all IGS stations arehigh , most of the short-temm ( 300 s ) stability is concentrated in the range df 1 ×10-" to 1 x 10~" , ac-counting for about 24.1 % of the total , while the number d stations with long-term stability ( day stability)better than 1 ×10- is large，accounting for about 65.0%. Based on the evaluation results , more than 100stations can be selected fron many high-perfommance receiver clocks to provide reference for GNSS server to calculate salellite clock error.

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