Abstract: Tumenzi landslide, located in Jiangjin region of Chongqing city, the creep deformation last ever since 1992, the resent accelerating deformation results in the broken of the road and houses in the sliding mass. Studied on the basement of the characteristics of the geology and deformation of the landslide, then did further research on the deformation mechanism and analyzed the stability of the slope. The research result shows that the landslide is in the stage of wholly creep deformation with partly sliding, the continually heavy rain is the main factor which may results in its broken, now it is in the limit state between unstable and stable, which may collapses entirely along several shear opening.