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A distributed security system based on wireless communication technology is presented in this paper. The system adopts distributed structure, which consists of detect sensors, intelligent terminal, alarm devices and wireless communication network. The intelligent terminal which designed based on embedded system is used to realize acquisition information submitted from detect sensors, control the alarm devices and communicate the information to the host or police. The alarm information and control signals transmitted between the detect sensors and intelligent terminal by dint of wireless communication network. A real-time routing protocol of wireless communication network is described. The protocol provides a predictable upper bound for the end-to-end delivery delay. The real-time end-to-end guarantee was achieved by geographic forwarding, periodic message exchange between neighbour nodes, and stateless one-hop delay guarantee. A lower power-consuming encoding arithmetic is detailed moreover. The security system which is digital, networked, wireless and moveable have abroad application foreground.