Abstract: With the application of laser jamming technology in the field of infrared imaging guidance weapons, the research of laser jamming effectiveness and anti-jamming technology are also paid more and more attention, and they are also closely related to the laser jamming model. In order to construct a high confidence laser jamming model, firstly, the physical model of laser jamming and the characteristics of full link transmission were analyzed, and a theoretical model of laser jamming spot was established. At the same time, the influence law of different wavelength laser in atmospheric transmission and the variation law of irradiance with different divergence angle with distance were analyzed. Finally, the results of laser illumination camera experiment and digital simulation were compared, and the coherence between the laser jamming solar flare model and the laser jamming spot was verified.