Abstract: In view of the problem of determining the parameters in the formula of PanJiazheng to calculate landslide surge in the reservoir area, the sensibility analysis of the number of series items and the wall reflection coefficient to the calculation of surge height is discussed. In this paper, Pan Jiazheng method is used to calculate the surge process of Bianjiazhai landslide in the reservoir area of Suofengying Hydropower Station. The results show that the calculation of surge propagation and height is sensitive to the selection of the number of series items, which increases with the increase in the number of series items, and the difference is large. When values are selected according to the table, the characteristics of landslide movement and water surface in the reservoir area should also be considered. Calculation is not sensitive to the wall reflection coefficient, and the error between the proposed value range and the median result is within 0.6%. When the wall is not clear, the median value can be taken.