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In this paper, we proposed an intelligent visual surveillance in specific sea-area based on video processing. We apply the technology of computer vision and video processing to implement the automatic system. At the first, we separate background and foreground in videos, and set a weight to update the new background. To extract the moving ships in videos, we apply the techniques including the change detection, the updated background, and the block enhancement. We apply the connect component labeling to each ship in the specified area of the port. Finally, we implement our ship-clocker system. Our system can analyze the moving direction of each ship, and track the ships. The experimental results show that this method can provide immediate and effective vessels information and data, the correct rate of 88.5 per cent more than they can be used as a follow-up of maritime traffic management basis.