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Moving object detection and tracking technology has great application value in military and civil fields. The traditional target tracking system based on PC couldn’t meet the requirements of volume, power consumption and flexibility. Based on the ARM processor S3C2440A and embedded Linux operating system, a complete and practical target tracking system was built. The system used the network camera to capture the moving target image, the processor to process digital image. This paper described the realization principle and process of image acquisition, target detection, image segmentation and tracking algorithm. Through the actual test, the system can meet the detection, tracking and identification of low speed moving objects, and has good real-time performance and stability.