Combined with the practical observation data from Sunkou Hydrologic Station in the lower course of Yellow River, the systematic analysis is made for the seiche in the downstream reaches of Yellow River. It is obtained that the seiche is the hydrologic phenomenon that the water level, flow velocity and sediment concentration would change greatly in a short time because of the backwater resulted from the sand-wave movement in the bend, which would resolve the difficult problem in water determination for water dispatching in Yellow River Basin.%结合黄河下游孙口水文站实际观测资料，对黄河下游地区较小流量级下所发生的假潮现象进行了系统分析，得出了假潮是由于沙波运动在弯道处因控导工程作用产生雍水和回水而引发的一种水位、流速、含沙量在短时间内发生较大幅度变化的水文现象，解决了在黄河流域水量统一调度中存在的水量确定难的问题。
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