"The monitoring system application software network management center centrally manages the equipment and data of large-scale video surveillance system. The center can connect and manage any number of front-end devices at the same time. The center performs remote configuration, status monitoring, and remote control of remote devices through graphics. Remote alarm information can be displayed in real time through lists or graphics, and remote video and audio multiplex transmission, multi-screen display, network storage, remote control and other functions can also be realized. The system adopts modular design. Software and hardware are commercialized, universal, modular structure, so that the system has a strong ability to expand, easy to maintain, manage and upgrade, maximize the protection of the user's existing investment.