An image simulation system of dynamic infrared point targets sweeping on sea surface is established.Because of a great deal of image data and targets of Infrared Rearch and Trcking(IRST) system

a method combining software with hardware is presented to solve the problems of real-time simulation. Aiming at long-distance dynamic infrared point targets

the infrared point targets and small targets are mainly simulated. The simple and practical models of background grey degree based on Gaussian distribution

dynamic infrared point target grey degree and running track are established. By adjusting average value and mean square difference

simulating background grey degree signal approaches to actually observing infrared image signal. The resuts show that the system can be used to test the ability of signal processing and target extraction for IRST in condition of limit background noise

also can ensure the effectivity of performance parameter of IRST system and reduce test cost and shorten development period.