A multi-form streaming media server system is proposed to overcome problems of traditional media server in Video Surveillance Networking System. This system has high expandability and stability by dividing traditional media server architecture into several modules according to its function. It can also realize the load balance and dynamic expansion. Based on this architecture, control protocol is designed, which includes Session Initial Protocol and private protocol. The experimental results show that this method of control can strengthen the reliability and manageability of the system.