Landslide is one of the most serious natural disasters, forecast and early warnings are important. The SMS backhaul of WSN monitor system is discussed in this paper. After analyzing the transmission system of WSN at present, this paper intend to combine GPRS-Internet, SMS-PP and SMS-CB to pass early warning back to inhabitants, so as to further ensure the reliability and instantaneity. In order to send early warning to every person in landslide zone, several situations are considered. With the real-time monitoring system and extensive early warning backhaul, the damages and losses would be reduced.