In this paper, a model of the video surveillance system is proposed, which is defined as the centralized, regional and local these three monitoring levels. The design and implementation of the system is described from the acquisition, transmission and monitoring subsystems. The problems that should be noticed in construction of the acquisition subsystem are pointed out. A variety of network technologies are analyzed from the view of the construction cost and post-maintenance. The transmission structure with disaster recovery performance is given on the basis of network contrast. In the end, the key technologies and functions of monitoring subsystem are given.