The paper introduces the video tracking simulation system with 3D virtual target system. The simulation has been used to the automatic target tracking system of chariots. And it describes a new method to detect and track moving objects in a dynamic scene based on background subtraction. We are especially careful of the core problem arising in the analysis of outdoor daylight scenes, continuous variations of lighting conditions that caused unexpected changes in intensities on the background reference image. Finally, experimental results and a performance measure establishing the confidence of the method are presented.