In order to solve the shortcoming of the traditional slice method in stability analysis and calculation of thrust-type landslide, based on landslide mechanism, the traditional slices mode was improved to establish a handy slope-stability-analysis model of thrust-type landslide. And a new safety factors was defined. The corresponding formula for calculating the stability safety factor was deduced. Moreover, the analysis computer program of thrust-type landslide was developed. The sliding form of thrust-type landslide and frail slices can be precisely distinguished by the program. Therefore, rational, accurate and economical measures can be taken to reinforce the slope. Comparing with traditional slice method, the safety factor of thrust-type landslide is usually smaller. The method is recommended to evaluate and reinforce the slope.