The influence degree of reservoir water level rise on reservoir bank slope is related to many factors, such as water sensitive stratum position, water level, sliding surface angle, etc. In order to study the influence of reservoir water level rising on slope stability during the impoundment process of Jingyugou reservoir in Bailuyuan, 51 slope profiles in the reservoir were counted and classified according to the slope evolution, stratum sructure, and the relationship between reservoir water level and stratum. The slope in jingyugou can be divided into tertiary sandstone mudstone slope, loess sandy mudstone gentle slope, loess sandy mudstone steep slope and eluvial soil sandy mudstone gentle slope. Four typical slope types were selected to establish the geological model, and Morgenstern price method was used to calculate the stability coefficients of the slope types in the process of reservoir water level rising. The results show that the stability coefficient of the tertiary mudstone slope, loess sand mudstone steep slope, loess sandy mudstone steep slope and eluvial soil sandy mudstone gentle slope in whale ditch is higher than the design safety factor of water conservancy and Hydropower Engineering Slope under any reservoir water level conditions. Due to Q_2-3 loess covering the whole slope, the stability of loess sandy mudstone gentle slope is poor. In the process of reservoir water level rising, the decline rate of stability coefficient is large, which is easy to form landslide and reservoir collapse. The calculation shows that the sliding volume of loess sand mudstone gentle slope under dangerous water level accounts for about 13% of the total sliding volume in the reservoir area.