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Traditional civil air defense alarm system is normally a single pathway triggered and real time and reliability are easily Limited. A multi network civil air defense alarm terminal that use the STM32 as the main control chip is designed. It is a variety of remote control alarm terminal, including three approaches for mobile communications, fixed telephone, and Ethernet network technology to trigger alarms. Three ways of arbitration using the first come first served rule. And the terminal architecture and operation principle is proposed to guarantee the rapid and real-time warning alarm when the disaster occurred. The advantages of different networks in different environments are fully obtained and the state information can be feedback. The system is stability, real-time, high reliability through testing. It provides a reliable method for the early warning of the disaster. 