The annual greatest tidal bore in the Qiantang River almost occurs during typhoons. Based on the measured tidal data and combined with the harmonic analysis of astronomical tides, the influence of typhoon on tide downstream of the tidal bore formation section in the Qiantang River Estuary was studied, and then the tidal bore changes indirectly caused by tidal changes was discussed. The results show that typhoons cause the changes in low tide level, tidal range, tidal bore arrival time and duration of flood tide, and indirectly affect tidal bore through typhoons, resulting in the changes in tidal bore height, steepness, propagation speed, arrival time and flow velocity. In general, during a typhoon, the tidal bore height at Yanguan increases by 0.18 m on average, and the time of tidal bore arrives 37 min earlier on average, the propagation speed of tidal bore from Ganpu to Yanguan increases by 8.9% on average, the steepness of tidal bore increases, and the velocity of tidal bore increases or decreases, but the unit width flow rate increases.
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