The simulation and evaluation of infrared imaging systems affected by the laser jamming has become an important issue in electro-optic countermeasure. The laser jamming effect to the target recognition of the infrared images is researched. The infrared images are researched and analyzed to implement synthesized simulation of special targets and scenes. The research object is infrared images. Through the processes of fusion simulation of target and scene, background suppression and target extraction, the performance changes of target detection are researched when the relative distance between the target and the laser spot is different. And experimental results and result analysis are provided.