Using the new channel simulation approach based on spectra matching, by means of the real data from the high spectral resolution atmospheric sounder, the brightness temperature in broadband imager IR channels of the observing target is simulated. The real data observed by IASI (Infrared Atmospheric Sounding Interferometer) are used to simulate the IR channels of the Imager (JAMI) of MTSAT 1R at 12：57UTC 14 February 2010, 00：57UTC 14 February, 2010, and 12：57UTC 2 May 2010. The results show that the absolute value of the average difference between simulating and observing brightness temperature is less than 1 K for JAMI IR1 IR4, and the correlation coefficient is lager than 0.93. The research shows that the method based on the high spectral resolution data is effective and can be used in the simulation of meteorological satellite IR channels. Moreover, the real data observed by IASI are used to simulate IR channels of the Imager (VISSR) of FY 2E, and the result shows that GSICS calibration improved greatly, compared with the operational calibration for IR2, IR3, and IR4 in November 2010.