Safe city is a very large, very strong comprehensive management system, not only need to meet the public security management, urban management, traffic management, emergency command, such as demand, but also take into account the disaster early warning, safety production monitoring of image monitoring requirements, should also consider alarm, access control and other supporting systems integration, and with the linkage of the broadcasting system. Currently using our digital broadcasting system and all-weather waterproof column series, can broadcast group partition, and carries on the intercom for help, and so on.