Abstract The landslide monitoring character and development status of landslide monitoring techniques are introduced. The application of wireless real-time telemetry system in landslide monitoring is summarized. The principle of KLA-1 earth surface displacement telemetry system is expatiated，and the application of this system in landslide monitoring in Tianchi Fengjie of Three Gorges Reservoir region is depicted in detail. The KLA-1 is an apparatus to measure the relative displacement of the surface，which has been used to monitor the displacement of landslides in Maoping，Yichang，and Pipaping，Wanzhou，Chongqing. The system consists of three major components，namely displacement sensing devices，data acquisition and launch module，data receiving and processing terminal. In actual monitoring process，when the landslide moves，there is linear displacement between monitoring point and fixed-point. The information is recorded by angular displacement sensor and converted into corresponding electrical data. The electrical data then are launched by the wireless transmitter module through GSM network to remote terminals，and PC as a terminal receive and the data are analyzed through corresponding monitoring software. According to data analysis，the relationship between displacement of landslide and time is obtained；the developing trend of this landslide is predicted. The veracity and real time of the monitoring device is proven，and the high practical value of this monitoring technology used to monitor landslide is indicated.
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Received: 08 September 2007
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