In order to study the distribution characteristics of wave field under different layouts of breakwaters in the engineering sea area of Yanwoshan,we carry out a numerical simulation of wave field near engineering area by using wave action conservation equation and Boussinesq equation to establish wave mathematical models in large and small scale,and analyze the wave parameters of wave observation station near breakwater.We change length and axis angle of breakwater based on the first plan so as to compare the shielding effect of waves under different layouts of breakwaters.The results show that when variation characteristics of wave field,wave parameters of wave observation station and effective shielding area are overall considered,the second plan is the suitable choice,the axis of the breakwater is intersected at the intersection of two dikes,the center is rotated 8°counterclockwise,and the embankment is extended 100 m to the east side.