Abstract: In order to better understand the differences and similarities between dual-frequency precipitation radar (DPR) on global precipitation measurement (GPM) and C-band dual-polarization Doppler weather radar (CDP) , a comparative study is implemented using their reflectivity factor data. First, observation data in time and space of two radar is matched by geometric matching method. Then, a typical case is selected for comparative study of stratiform and convective precipitation. Meanwhile, a statistical comparative analysis of 15 pairs of matched up data in 2016 is studied. Through this study, the CDP is found to have a good correlation with DPR, with coefficient of correlation up to 0. 81, and their precipitation echoes are basically consistent. Compared with convective precipitation, radar relevance of stratiform precipitation is better.