Abstract: The indoor wave force test on the coupling system of single column pier and self-floating anti-collision device was carried out. The AQWA numerical model was verified and calibrated by the test results. According to the distribution of wave pressure on the structure, the corresponding load and the structural hydrodynamic coefficient were extracted by Morison formula. Considering the influencing factors such as wave height, wave period, section form, size of anti-collision device and self-floating ratio of device, the quantitative relationship between force coefficient and relevant factors was established. The test results show that the motion of the self-floating device produces radiation wave, which makes the wave pressure of the pier larger. The ratio between the contact force and the wave force can be defined as the contact force coefficient. The calculated results show that the inertia force coefficient of the pier is about 2.175, the inertia force coefficient of the anti-collision device is about 2.125, and the contact force coefficient is about 1.340.