Arc crown wall has excellent wave return effect and many engineering applications. Taking the arc crown wall as an example，based on the OpenFOAM open source program，we develop a two-dimensional numerical model for the action of waves and structures using the Renault average Navier-Stokes equation to describe the fluid motion. The numerical model is verified by the test results，and the similarities and differences of wave pressure distribution characteristics of different types of arc crown wall and the influence of arc radius of arc crown wall on wave force are discussed. The results show that under the conditions of different wave elements，the wave pressure on the wave face of the arc crown wall decreases with the increase of the elevation of the measuring point，the wave pressure on the same pressure measuring point decreases with the increase of the arc radius of the arc crown wall，the wave force on the wave face of the arc crown wall increases with the increase of the wave height，first increases，then decreases and then increases with the increase of the wavelength，and the wave force reaches the maximum at the maximum wavelength. At the same wavelength，the wave force decreases with the increase of arc radius.