应用系统分析的方法，通过系统解耦将以三峡为中心的长江防洪系统分解为３个子系统，建立了大系统解耦模型．根据子系统之间的耦合关联，提出了各子系统模型解算及全系统的总体协调的解算方法．对长江３次大洪水进行防洪系统联合调度解算，其结果表明所提出的模型和算法是合理的，可明显提高防洪效益． By means of system analysis, the Yangtze River flood control system centered on the Three Gorges is decomposed into three subsystems by system decoupling, and a large system decoupling model is established. According to the coupling relation between subsystems, the solution to each subsystem model and the overall system coordination is proposed. The joint operation of flood control system for the three major floods in the Yangtze River is solved. The results show that the proposed model and algorithm are reasonable and can significantly improve the flood control benefit.