Abstract:  This thesis analyzes under extreme situations as road disruption, power failure and network disconnection caused by big earthquake or disaster, the weaknesses of rescue team communication, and proposes solutions. The discussion demonstrates a need for a light cavalry communication team, a volunteer team for observation and rapid report; a satellite and ad-hoc network; and a star-shape and umbrella-shape network. The feasibility of guaranteeing emergency communication support under extreme situations is discussed, and the construction standards and promotion measures are put forward. 

Key words:  extreme conditions, emergency communication guarantee, audio and video communication, command and dispatch