It was thought that an equivalent atmospheric sounding channel can be obtained by a lot of simulated computation, of which the peak height weighting function is higher than that of the first channel of HIRS/2 instrument onboard the NOAA serial meteorological satellites of USA.By comparing the retrievals obtained from the equivalent channel with original retrievals, the result shows that there is an improvement on the temperature retrievals by adding the equivalent channels, particularly on stratosphere (50-2hPa) profiles with the average improvement of 0.27K.