The design idea of emergency broadcasting system based on Beidou RDSS is put forward. In view of the problems existing in the current emergency broadcasting system in the face of military disasters such as air attack and biochemical threat, such as single communication means, unreliable link and lack of connectivity with other platforms. An emergency broadcasting terminal and system supporting Beidou Positioning, short message, 4G, FM, short wave radio and other communication modes is proposed, with emergency alarm ,voice broadcasting, voice synthesis. The functions of time synchronization, regular broadcasting and online live broadcasting have significantly improved the reliability and availability of the current emergency broadcasting system.