Abstract: Typhoon In-fa, making landfall in Zhoushan on July 25, 2021, which coincided with the astronomical spring tide, had an effect on the Qiantang tidal bore. A typhoon model combined with a parametric hurricane model is developed to study the effect of the typhoon on tidal bore. Field data during the landfall of Typhoon In-Fa was used to verify model result and the changes of tidal level and tidal bore during the landfall of Typhoon In-Fa were well reproduced by the model. The model schemes were proposed to separate the direct and indirect effects of the typhoon. It is demonstrated that the direct effect of the typhoon on tidal bore is obviously smaller than the indirect impact due to wind field during the landfall of Typhoon In-Fa. Tidal range at Yanguan station during the typhoon is 3.59 m and the propagation speed of tidal bore from Yanguan to Laoyancang is increased by 7.7%. The heights of the line-shaped tidal bore and the back-flow bore have an average increase of 0.30 m and 0.22 m, respectively. The arrival time of the line-shaped tidal bore and the back-flow bore in Yanguan reach has an advance of 62 min and 65 min during the landfall of the typhoon.