Communication terminal joint defense alarm method and system thereof

The invention provides a communication terminal joint defense alarm method and a system thereof. The method comprises the following steps that: a mobile switching center receives calling information which comprises a calling terminal number and service platform short number and is sent by a calling terminal, inquires and obtains a service platform long number corresponding to the service platform short number according to the calling information, and connects to a service platform according to the service platform long number; the service platform inquires user information in a same group corresponding to the calling terminal number according to pre-stored user group information, and successively calls users in the same group corresponding to the calling terminal number so as to complete the alarm. By using the method and system of the invention, a user side can use the short number and carry out calling continuity according to the corresponding long number. A suitable scope is expanded and calling efficiency is increased.