According to the horizontal plate-type breakwater and inclined plate-type breakwater,we propose a“厂”-type breakwater and study the wave dissipation performance of it by numerical simulation method. At first,we establish the two-dimensional regular wave numerical model based on the software FLUENT,and verify the effectiveness of the water tank. Then,we obtain the variation of wave height behind the breakwater-time relationship through simulation,analyze the transmission coefficient,and discuss the relationship between the transmission coefficient of new breakwater and the wave height,wave period,opening rate of the breakwater,relatively plate width,wave steepness,angle between inclined plate and horizontal plate and the distance from still water level to the structure top. The results show that within the simulation scope,the breakwater has a transmission coefficient and wave absorption performance,especially for the long-period wave.The research result may serve as reference for the design of new-type breakwater.