Abstract: This paper presents the design and implementation of an automatic monitoring and alarming system for the slope stability based on the fiber optical fault locating theory. The system components and their structures, functions, targets and software as well as hardware design and fabrications are introduced in the paper. The new device monitors the target slope with a systematically distributed monitoring points. It has the advantages of flexible monitoring points, low cost, easy to operate, reliable monitoring results and suitable for the remote monitoring. This device has also the advantage over the conventional monitoring device that can only monitoring several important local points and therefore is suitable for the higher grade roadway slopes with large monitoring points.\=

Key words: Slope Stability, Monitoring and Alarming System, Fiber Optical Fault Location, Optical Time Domain Reflectometry