The spectra of O2 A-band(0.76 μm)and CO2 near-infrared emissions(1.6 μm)for Medium-resolution Satellite(SCIAMACHY)are simulated by the SCIATRAN model(V3.1.29),and compared with the ESFT and LBL method,as the inversion accuracy and time consuming.The time consuming of LBL was more than ESFT with the relative error less than 1%,especially for the CO2 band.But for the CO2(2.0 um)of High-resolution Satellite,the opposite result was found.That is to say,the LBL method was more suitable for High-resolution Satellite.Different wavelength intervals and integral wavelength steps are applied to the LBL to select the most appropriate combination for High-resolution SatelliteO2 A-band(0.76 μm)and CO2 near-infrared band(1.58 μm).