The open type breakwater with double baffles has good wave attenuation effect,and has the characteristics of water permeability and environmental protection,which can meet the requirements of the functions of structures due to the marine environmental protection.A study on wave loads acting on a opentype breakwater with double baffles under wave action is conducted to address the current shortcomings in hydrodynamic characteristic research of such structures.A numerical flume is built on the basis of the Fluent model,and the interaction between waves and the breakwater with double baffles is simulated.Then the influence of relative water depth,depth of baffle into water,width on wave load under different wave surface condition between two baffles is analyzed under different water surface conditions between baffles.The results show that when there is no free water surface between the two baffles,the structural load is less affected by the relative water depth and width of breakwater,and increases with the increase of depth into water.For the free wave surface condition,the water movement between the baffles significantly affects the wave load of the structure,the maximum load of the structure will increase significantly,and the relationship between the structural load and the influencing factors will also change.The condition of the free water surface between the two baffles is a common operational state for breakwaters,and it should be given full consideration during the structural design process.