Because of the serious damage induced by the potential energy in the failing process of irregular slope high-locality landslide，the PFC2D discrete element numerical simulation software was adopted in this study to form the unstable sliding body using particle elements. Based on the inverse discrete Fourier Transform Method（FTM），the slope model with irregular geometry was generated. That it was then imported into the PFC2D for numerical calculation. The correlation between the instability motion characteristics of the high-locality landslide and the slope surface geometry under different values of the Fourier description factors（D2，D3，D8）is studied. The results show that the motion characteristics of the two types of sliding bodies（viscous and non-viscous）are significantly affected by the slope profile.