Adopting the rain rates of 70 rain stations in Jiangsu Province as criterion，this paper compared and analyzed the applicability of precipitation products from GPM DPR in a whole year. The comparison indicates that the best time for matching of NS (Normal beam Scan), MS (Matched beam Scan) and HS (High Sensitivity beam) occurs at several minutes after overpass time. Taking NS products as an example, the annual root mean square error, correlation coefficient, and the relative bias of NS products is 2 mm/h, 05 and -20%. The precision in summer is the best, compared with other seasons. The analysis of DPR error shows that the estimated rain rate is quite sensitive to the adjusting factor 〖WTBX〗ε. 〖WTBZ〗Furthermore, the lack of algorithm limitation of 〖WTBX〗ε 〖WTBZ〗leads to the abnormality of PIA (PathIntegrated Attenuation) in the SLV module, resulting in error in precipitation retrieval.