As a second generation of China’s polar meteorological satellite

FY-3A and FY-3B were launched in 2008 and 2010

respectively

in sun-synchronous orbits located at the altitude of 831 km. FY-3A and FY-3B load totally 11 sensors

including microwave sensors

including microwave temperature sounder （MWTS）

microwave humidity sounder （MWHS） and microwave radiometer imager （MWRI）. Analysis on technical features of FY-3 MWRI and AMSR-E and intercalibration can be of greatly help for future applications. In this paper

the FY-3 MWRI data over Yangtze River during spring and summer seasons of 2011 were collected because of serious drought

high temperature

precipitation and flooding. Based on radiative transfer and MWRI features

the polarization and scattering indexes for monitoring drought

precipitation and flooding happened are quantitatively analyzed. Results were also compared with both AMSR-E data and ground station records during the same periods.