Abstract：Presently，scientists often perform the simulated analysis of the mechanism of slope slip with the aid of tests in laboratory. Based on the tests in laboratory，many models of slope slip have been established. The experimental models have different characteristics and different adaptabilities. The representative of actual landslide with laboratory results leaves relatively large errors，even great falsehood，sometimes. How to recognize fundamentally the actual mechanism on landslide is one of the problems on which the author and his research group have studied for more than ten years. The method on which the author and his research group study depend is prototype monitoring analysis method. Based on ten years¢ in-situ monitoring data，this article analyzes the external cause and internal cause of landslide，and concludes primarily the relevant relations between the slide and the various factors of landslide with the aid of the mathematic simulation theory are primarily achieved. Also，it depicts some effective methods and techniques on slope slip field monitoring (including GPS，measuring robot，etc.).
