Abstract: There are three issues discussed. First, the landslide stability evaluation judgment indices of the segmented sliding surface are analyzed. In addition to the index of residual downslide force P_n, the evaluation analysis by the landslide stability indices of the KT type and R/K type are introduced. Second, based on the comparative analysis of the calculating methods of the stability indices, such as segmentation equilibrium method, summation equilibrium method, horizontal projection method, and so on, the practical significances, advantages and disadvantages, scope of the application of the methods are proposed. Third, the different concepts of K value in the landslide stability evaluation, back calculation of shear strength parameters and the calculation of landslide thrust are investigated.