In order to explore a new kind structure with excellent wave effect and small force,we compare the hydrodynamic characteristics between single board and single arc board breakwaters,and analyze the relationship between the transmission coefficient and the reflection coefficient,pressure and the flow field around the structure under the different wave parameters situation.The results show that the transmission coefficient of the wave of single arc board breakwater is obviously smaller than single board breakwater when the structure is in the condition of water emergence,but it is opposite when the structure is in the condition of water below,at static water surface the two are equivalent.The reflection coefficient of the wave of the single arc board breakwater is slightly larger than that of single board breakwater in the condition of water emergence.However,the reflection coefficient of the wave of the single board breakwater is obviously larger than that of the single arc board breakwater in the condition of static water surface and water below.The pressure differences at different measuring points on the upper surface of the two structures are large,while the difference on the lower surface is relatively insignificant.