The floating breakwater has the advantages of not affecting material exchange in sea area and low cost. But the disadvantages of high requirements to the structural connection and mooring system of the floating breakwater limite its application and developmet，inorder to overcome these disadvantages and give full play to the effect of wave elimination of the floating breakwater，we verify the effect of wave elimination of the new steel structure of the floating breakwater by physical model test with large-scale wave test flume. The correlations between the transmission coefficient（Ct）and the relative draft（t/D），the relative water depth（t/L）and the relative width of the breakwater（W/L）are studied. The results show that when the wave period is less than 6 s，the transmission coefficient（Ct）of the new steel structure floating breakwater can be less than 0.5，which verifies the effect of the new steel structure floating breakwater.