Based on the analysis of the relationship between the tide level, the specific gradient and the periodic variation of the flow velocity, the study concluded that: The average tide of the Yangtze River estuary is decreasing along the path; the slope is decreasing along the way; the average tidal range increases gradually, to reach the maximum station near the cowhide reef, which reflects the process of runoff and tidal power change. Through the study of the Yangtze River Estuary tidal range, it

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... ound that the Yangtze River Estuary tide follows different rules and variable partition boundaries, and the limit decreases with increasing runoff. The boundaries located between Baimao and Yanglin stations in flood years, and located between Shidongkou and Gaoqiao stations in dry years. Through comparative research on the relationship between the slope and tidal velocity cycle, which reveals the change of trend lags behind the change of slope due to the inertia the runoff. These conclusions are of guiding significance for different channel sections of the Yangtze River in the channel regulation and channel regulation.