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Target recognition and tracking is an important part of intelligent security monitoring video processing system. In order to satisfy the requirements of real-time and miniaturization, a target recognition and tracking system based on FPGA is designed in this paper. In the system, the CMOS digital camera is used to collect original video data, and the off-chip SDRAM is the video stream buffer and storage medium. The image processing part is completed by FPGA, including gray processing, inter-frame difference method, and the results are transmitted to the display terminal to realize the video acquisition, target recognition, tracking and display. The test results show that the whole system can track the target object effectively and stably. It can be further applied to security monitoring system.