The infrared laser occultation (LIO) technique based on the low earth orbit satellite network can perform an active detection for vertical profiles of greenhouse gases in the earth's atmospheric, thereby providing a new method for global greenhouse gas concentration profile measurement. In this paper, the principle of the concentration profile measurement of the LIO technique is introduced. The influence of the operation wavelength on the detection accuracy of the most important greenhouse gas CO2 is simulated by establishing the LIO signal link model. Subsequently, the detection wavelengths for CO2 are optimized based on the simulation results with the minimum error. Additionally, the detection performance of the LIO technique is analyzed using the selected wavelengths. Finally, the wavenumbers of 4771.6215 cm -1 and 4772.0240 cm -1 available for the CO2 concentration profile detection are selected. The selected wavelengths can achieve a vertical resolution of 0.6-1.4 km in the altitude range of 5-35 km. The relative random error of profile detection is lower than 0.8%. The minimum relative random error (0.229%) appears at 10 km. The research results can provide an important reference for the design of a prototype of spaceborne LIO atmospheric detection system.