Abstract: The disaster-causing factors and the instability mechanism of the landslide are clarified through the on-site investigation of the landslide disaster in Zhonghaicun area in this paper. And the dynamic parameter inversion analysis of the landslide is carried out based on the numerical model of the continuum mechanics theory. The results show that the continuous rainfall and the special lithological characteristics of the Quaternary Sigda semi-diagenetic rocks are the key factors for the occurrence of Zhonghaicun landslides. The landslide movement lasts about 70 s, and the pore water pressure coefficient of the landslide is 0.8, with maximum accumulation thickness of 8 meters and maximum movement velocity of 16.2 m/s. In the entire process of landslide movement form and velocity evolution, the main accumulation areas are the 1st-level platform and the 3rd-level platform. The movement speed has three peaks, and the stepped terrain is the main reason for the staged speed peaks.