Abstract: Automatic monitoring technology is the development direction of slope monitoring in future as it saves time and effort and can work in real time and all-weather. In this paper, an automatic monitoring technology which only uses the comprehensive measuring instrument for settlement and dip angle was introduced. It was applied to the monitoring of a high cutting slope of an expressway, and the slope landslide was successfully warned. The comprehensive measuring instrument for settlement and dip angle is of high precision and relatively low price. It could monitor the ground surface settlement, and also the ground surface inclination. It should be suitable for all kinds of slope monitoring and is worthy of popularization and application in automatic slope monitoring in the future.

Key words: slope, automatic monitoring, comprehensive measuring instrument for settlement and dip angle, landslide, early warning