Abstract: In order to verify the development status of GNSS receiver, fully confirm the receiver performance of the international GNSS monitoring and assessment system (iGMAS) monitoring station, and make contributions to the subsequent Global Navigation Satellite System (GNSS) receiver data quality assessment. Based on iGMAS multi-brand receiver comparative measurement experiment, the receiver performance and the quality of observation data were evaluated comprehensively by statistical analysis of the observation data quality (integrity rate, multipath, cycle jump ratio, observation noise) and the relative positioning accuracy of zero base line at different frequency points of multi-brand monitoring receivers. The results show that the data quality and performance of iGMAS monitoring station meet the corresponding standards. In terms of data integrity rate and multipath, the domestic brand receiver is basically equivalent to the foreign horizontal receiver. In terms of cycle jump ratio, pseudo-range, carrier phase noise and relative positioning accuracy of null base line, the domestic monitoring receiver is obviously better than the foreign monitoring receiver.