Abstract: For hydropower stations of weak regulation capacity that usually have large variation of reservoir levels during in a month of the flood season, it is difficult to realize real time-update operating process by the conventional water level control method that takes month or ten days as the calculation period. In order to determine the intra-month discharge flow reasonably according to the water level control rules, and to improve the comprehensive efficiency while ensuring flood control safety, a multi-objective daily water level control method was proposed by integrating power generation, water abandonment and peak regulation. In the method, the maximum non-abandonment probability is introduced to describe various incoming water processes, and the upper limit of reservoir water level is used to invert the highest daily water level control process without abandonment under different incoming water scenarios. Finally, the daily water level control process that meets the operating objectives can be selected in the water level process set. Taking Jiangkou Hydropower Station in Chongqing City as an example for verification, the results show that the proposed method can give water level control processes that meet various dispatch requirements, indicating that the method can generate daily water level control processes suitable for various operating requirements when the operating objectives change at different times, thus it can effectively guide the actual scheduling operation.