It is important to accurately calculate precipitation recharge coefficients for water evaluation. The dynamic water level method is widelyused in calculation of precipitation recharge coefficients because of its convenient operation, low cost and high precision. Due to that the traditionaldynamic water level methods usually take single precipitation recharge progress as calculation bases and ignore the problem of groundwaterexertion and recharge lag, however, there is some calculating deviation. According to water balance, this paper put forward an improved dynamicwater level method by changing multiple precipitation processes within a year into an integrated long-term precipitation to solve the above problem.Taking the Daniuzhuang Village in Jinniu Town of Cangzhou City as a study case, the traditional and improved methods were compared. Theresults show that the deviation of precipitation recharge coefficient from the improved method is less than that from the traditional method.