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Motion target detection and tracking is widely applied in many fields, taking great convenience for people's life and work. In this paper, a difference-image-based motion target detection and tracking algorithm which uses statistics method and fits for embedded system, is presented. Use XScale 32 bits processor PXA270, transplant the embedded Linux and Qt/Embedded as embedded graphic library, carry out this motion target detection and tracking system by adopting mmap means capture data from camera. Experiments result shows this system has a preferably capability.