Laser interference is an ideal means for future anti-infrared early warning satellites. In order to assist the commanders in analyzing and formulating the laser deployment plan,the effective suppression area indicators of laser interference to infrared early warning satellites are proposed. Firstly,the early warning detection principle of infrared early warning satellite and the action mechanism of laser interference to infrared early warning satellite are analyzed. Secondly,the maximum detection distance model of infrared early warning satellite under non-interference and interference conditions is established,and the maximum detection distance of SBIRS GEO satellite is studied. Finally,the effective suppression zone index of laser interference to infrared early warning satellite is defined,and the calculation method is given. The effective suppression zone of laser interference to SBIRS GEO scanning and gaze detector is studied. The results show that as long as the output power is strong enough,for the scanning detector,one laser can cover the whole country of China,and for the gaze detector,multiple lasers need to cooperate in order to realize the full coverage of the rising section of the missile.