Abstract:The process of the landslide from beginning deformation to global sliding failure generally includes the initial deformation,constant speed deformation and accelerated deformation. Different deformation stages have their own different characteristics. The understanding of inherent characteristics of various stages to provide the basis for landslide warning and forecasting is the hot issue for scholars. Based on a large number of landslide deformation monitoring data,the change laws of accumulative displacement,deformation rate,acceleration,etc. are researched;and it is found that the changes of acceleration performance have different characteristics with accumulative displacement and deformation rate. Over the period before the landslide reaches critical sliding stage,the acceleration value is basically around 0. While landslide is under critical sliding stage,the acceleration is suddenly increased and shows significantly catastrophic characteristics. In other words,the acceleration before and after the landslide is under critical sliding stage shows completely different characteristics. Aiming at the above characteristics,the early-warning prediction indicator d for critical landslide sliding is proposed based on the acceleration. According to the indicator,automatic early-warning predication of critical landslide sliding is expected to achieve.