Aiming at the actuality of a single monitoring system such as isolated information and without related alarm linkage among subsystems, the existing equipment resources and network are applied to design an ammunition depot security defence system combined with its safety technology requirements and the unified control strategy, which effectively solves the problems in the linkage operation among the subsystems, and finally realizes the information sharing, system related action as well as long distance monitoring. The system has high integration and has been successfully going well more than a year. Its successful realization improves safety level of the ammunition depot, and its design idea has very high application value for other more comprehensive security areas.