Abstract: Based on the cause analyses of the water level falling downstream of Shuikou Dam, six schemes are developed to solve the problems of the durative falling of water level. According to the results of physical model tests, mathematical model and ship model tests, the navigation conditions, construction conditions and project investment of each scheme are analyzed and compared. Furthermore, effects on the output of power station, reservoir flood and flood control of each scheme are analyzed. Finally, the best regulation scheme is recommended.