Abstract: For the disabled problem of alarm function of remote alarming system caused by failure or being broken of the system, a new remote alarming system was designed which can feedback information in two-way. The system is consisted of main receiver and monitoring extension, and the extension can send (alarm) signal to the receiver, the receiver also can inquiry the operation status of the extension. The system has functions of self-check and inquiry and so solves the difficult problem that the self-failure cannot be found easily.