According to the advantages of flexible floating breakwater which has better cover on short wave,long wave,proposes a log damping type flexible floating breakwater structure.Based on the regular wave physical model test in a two-dimensional water tank,this paper studies the wave dissipation performance of the flexible floating breakwater with plate and without plate,and the test results are compared and analyzed.The experimental results show that the flexible floating breakwater has a good effect on short wave and long wave,and the flexible floating breakwater with plate is better than the flexible floating breakwater without plate.