A method of simulation for space target moving simulation based on space-based camera is presented.The TLEs are used to predict the relative position vector between the target and camera.From the geometric position the paper analysis moving characteristics of the target.At the same time,factors which can effect positions of the fixed-stars are considered.Then,the standard transformation between the photometric magnitudes and the gray level is put forward.Finally,supposing that the observing satellite orbit is the same as the MSX,the article analyzes the movement characteristics in serial images of the target.It has been proven that the simulated serial images are of high accordance to the SBV observation images.