It is comparied between two infrared cloud-cleared radiance retrieval approaches,i.e.collocated infrared and microwave measurement and collocated infrared imaging and sounding measurement.It is found that AIRS/MODIS cloud-cleared radiance approach perform better than AIRS/AMSU cloud-cleared radiance approach relative to the collocated MODIS clear averaged radiances.The temperature and total precipitable water retrieved by AIRS/MODIS cloud-cleared radiance approach fit well with that objectively analyzed by ECMWF(European Center of Medium-range Weather Forecasts).Preliminary results show that the two approaches,though essentially different,are both effective and complementary.When the microwave measurements are unavailable,the synergistic imaging/sounding approach is the only reliable one,which can indirectly use the cloud-contaminated infrared measurements.