This paper set up an energy density model of the laser irradiation on the satellite-borne photoelectric detector.Attenuation effect of the laser beam propagating through atmosphere and far-field laser size estimation was studied,the jamming mechanism of detector by laser was introduced,based on the brief depiction of early-warning satellite photoelectric detector.1.06 μm laser irradiating HgCdTe detector was by laser given as an example.Analyzed the saturated jamming ability of laser weapons to the photoelectric detector of early-warning satellite of infrared system on the sky quantificationally based on emulation calculation.