The algorithm of cross calibration between IRMSS aboard on CBERS-1 and FY-1C or Landsat-7 ETM band 6 has been built. Two sets of cross calibration results between Landsat-7 ETM band 6 and IRMSS band 9, FY-1C band 4 and IRMSS band 9 were obtained. The bias of the same point controlled relative-err analysis is 1.2K, and the average root-err between IRMSS band 6 and ETM band 9 is 1.6K.