Combined atmospheric radiative transfer (CART) model based on moderate resolution imaging spectroradiometer (MODIS) level2 cloud products, atmospheric infrared sounder (AIRS) level 2 atmospheric products and AIRS L1B product is used to simulate and analyze brightness temperature at the top of ice clouds atmosphere at 9 μm (band from 1070 cm-1 to 1135 cm-1), 11.03 μm (band from 886 cm-1 to 928 cm-1) and 12.02 μm (band from 815 cm-1 to 850 cm-1) bands. Brightness temperatures between AIRS observation and simulation brightness temperatures with retrieved ice clouds parameters and MODIS cloud product at three bands are compared and analyzed. The probability distribution of brightness temperature difference between simulation with retrieved ice clouds parameters and AIRS observation is studied. Results show that distribution of brightness temperature simulated based on retrieved ice clouds optical thickness and cloud top height is consistent with AIRS observation at three bands. Correlation coefficient of brightness temperature between them is bigger than 0.98.The brightness temperature difference between model simulation and AIRS observation at 11.03 μm and 12.02 μm bands is at the range from 0 to 5 K, and 0 to ±0.5 K at 9 μm band. It is definitely accurate and reliable to simulate atmospheric radiative properties under actual atmospheric conditions with retrieved ice clouds parameters.