Based on the field survey, using universal distinct element code(UDEC) to build the basic geometric model, the movement-stop and accumulation process of slope foot site landslide were simulated, and then the deceleration mechanism of slope foot condition(including gradient and underlying surface friction coefficient) to landslide movement was analyzed. By comparising the deceleration distribution curve of the monitoring sites obtained under the same landside scale, the results showed that the sliding distance of the landslide in the speed decreasing process increased sharply first and then decreased with the increase of slope gradient, and the energy transfer caused by the slope strike was crucial to the sliding distance during the deceleration phase. Meanwhile, the sliding distance was closely related with the underlying surface friction, the lower of the underlying surface friction caused the more energy transfer and the more serious landslide disintegration.