Abstract: In this paper, TEQC software was used to evaluate the observation data quality of 59 GNSS stations in Hebei Province from January to September 2019. The results show that the data quality of most stations is good and meets the requirements of crustal movement monitoring. The influence of multipath effect on the data from 11 stations is large. The influence of multipath effect MP1 and MP2 can be reduced by means of data post-processing, etc., which can be used for crustal movement monitoring. The data quality of SW01, SZHJ, SZJO, SZLF and SZWX stations is poor, so it is not recommended to be used for crustal movement monitoring. The data quality of SZKB station has been significantly improved from June to September 2019, meeting the technical requirements of crustal movement monitoring. Therefore, it is suggested to evaluate the quality of longer time data. The factors affecting the data observation quality of SW01, SZHJ, SZJO, SZKB, SZLF and SZWX stations with poor observation quality were analyzed preliminarily and reasonable suggestions were given.