It is available to analyze on-orbit performance stability of MWRI by statistic histogram data of earth cold targets with stable brightness temperature.This paper analyzed on-orbit performance stability of MWRI by adopting the brightness temperature data onboard FY-3(02) satellite during February and July in 2011
showing that the MWRI onboard FY-3(02) meteorology satellite performs stable on-orbit
and the max fluctuation of the coldest reference values of all the 10 channels are less than 1.8 K.