Abstract: As the third pitch of Chinese second generation operational meteorological satellites on polar orbits, FengYun-3 (03) pitch satellites consist of one early morning orbit satellite, one morning orbit satellite, one afternoon orbit satellite and one rain measurement satellite. The primary instruments being loaded on the FengYun-3 rain measurement satellite (FY3-RM) are the dual-frequency precipitation measuring radar (PMR), the microwave imager (MWRI), the simple type median resolution spectral imager (MERSI-S) and the global navigation satellite system (GNSS) radio occultation sounder. This article analyze the function, performance and the designed characteristics of the FY3-RM by using simulation technology, and discuisses its power of measuring precipitation. The analysis results show that, 1) the PMR has the same precipitation measuring ability as the Global Precipitation Measurement (GPM) dual-frequency precipitation radar (DPR); 2) the FY3-RM can detect the three dimension structure of the typhoons effected on China; 3) the additional channels between 50 GHz and 60 GHz and channels around 118 GHz increase the MWRI sensitivity to light precipitation over land, comparing to the GPM microwave imager. Therefore, the whole power of precipitation measurement of the FY3-RM, altogether with other instruments onboarded, is better than that of the GPM satellite.