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The Fengyun3 rain measurement (FY3 RM) satellite will be used to observe strong precipitation like typhoon and so on, and also to observe other precipitation over the low and medium latitude areas. The accurate 3dimension structure of the precipitation will be achieved by its core payload, the dualfrequency precipitation measurement radar (PMR). The main performance characteristics of PMR for the application including the range resolution, horizontal resolution, scan angle, antenna sidelobe, measurement accuracy and beam matching accuracy are analyzed by simulation. The analysis results show that the PMR has the same precipitation measuring capability as the Global Precipitation Measurement dualfrequency precipitation radar. In order to validate the function of PMR, some flight experiments were carried out by its airborne proto in 2010The capability of detecting precipitation of the protoradar is analyzed using the data achieved during the experiments, and the functions and the main performance characteristics of PMR are also validated.