According to the model experiment on the wave forces on the upper structure of the wharf under combined conditions of different water stages and the same wave parameters, we obtain the maximum horizontal wave force, the maximum uplift wave force on the upper structure of wharf, the uplift wave force corresponding to the maximum horizontal wave force, and the horizontal wave force corresponding to the maximum uplift wave force. The phase difference between the maximum horizontal wave force and the maximum uplift wave force are analyzed, and the tested data for the maximum uplift wave force is compared with the theoretical value. The experimental results show that with the increase of water level, wave force on wharf upper structure increases first and then decreases. In the design high water level, wharf忆s upper structure suffer the maximum wave force; the maximum uplift wave force and the maximum horizontal wave force do not appear simultaneously, there is a phase difference.