Abstract: Based on disscusion about prediction and forecasting of landslide happenning time and division of warning classes of landslide,a synthetical warnning method of landslide dangerous state is put forward,which combinates macro prognostication information of landslides,deformation rate of speed of monitoring points in key parts of landslides and other relevent factors.The new warning method of landslide dangerous state is applied to determinate dangerous state of Baishuihe Landslide in Three Gorges Reservoir Area,and the result indicates that the deformation of the landslide is obviously relevent to going down of Yangtze River water lever and rainfall.