Aiming at the problem of acquiring the target data for the infrared space target recognition,a simulation research on the simulation of target infrared grayscale was conducted.By calculating the orbital motion parameters of the target and the detector,combined with the micro-motion characteristics of the target,the projected area observation model of the detector plane was built.Target surface temperature distribution model was built to obtain the target infrared radiation intensity sequence received by the detector.Different from former methods,the imaging effect of infrared detector was considered to achieve the infrared grayscale series.Simulation results demonstrated that targets with different motion parameters and shapes present different sequence periodicity.And the results can provide data support for the remote aerial targets recognition algorithm.The target data simulation model narrowed the gap with the real scene,which was of great significance to the space target recognition system.