通过物理模型对悬板区流场的测试分析，以及整体模型的浑水输沙试验，揭示了悬板分层式引水渠首“引清”及高效输沙的内在原因，是悬板的设置改变了悬板区水流结构，即悬板水平分割水流，引上层清水，下层由明流生成为有压流，提高了底部流速及流速梯度，获得较高输沙能量，使其高效输沙。 Through the physical model test and analysis of the flow field in the hanging plate area and the muddy water and sediment transport test of the overall model, the inherent causes of the “clear-up” and high-efficiency sediment transport of the cantilevered diversion channel are revealed. Changing the water flow structure in the hanging board area, that is, the suspended board horizontally divides the water flow and leads to the upper clear water, and the lower layer is formed as a pressurized flow by the Mingliu stream, which increases the bottom flow velocity and the flow rate gradient and obtains high sediment transport energy for high-efficiency sediment transport.