Comparison is carried out between upward radiance at the top of the atmosphere and downward radiance on the ground calculated with the discrete ordinate method and LOWTRAN7 code at some different wavelengths from infrared to ultraviolet under different atmospheric conditions.In general,the difference between them is less than 20%, indicating that the LOWTRAN7 code has rather good accuracy in radiance calculations.The Key Project of National Fundamental Research supported by the National Natural Scence Foundation of China.