Abstract: The performance test of the continuous operation reference station(CORS) system is critical and its metrics directly determine the accuracy, availability and reliability of the services provided. A comprehensive CORS network data quality inspection and performance testing method is established based on the CORS data processing practice. This method uses GAMIT, TEQC and other software to introduce data integrity, cycle-to-hop ratio, multipath, static and dynamic positioning accuracy. Performance metrics such as system reliability, time availability, and space availability are tested for performance on the server and the client. The CORS data of Zhengzhou (ZZCORS) spanning one year and the static and dynamic measured data of several days are selected in the experiment. The results show that at the service end, the data quality of the base station is better and the position accuracy is higher, but the vertical settlement of individual base stations is larger; on the user side, the space availability in most areas of Zhengzhou City is good, which can meet the user's different precision positioning requirements.