Abstract: This paper presents the structure and working principle of an oscillating flap-type wave energy device integrated with a breakwater.The physical model tests were carried out in the comprehensive laboratory of estuary and waterway at Hohai University.The friction force between a heavy block and a stainless steel plate was employed as the damping load for the developed device.Then,the output power can be estimated conveniently using the tension forces and the displacement of steel plate measured during model tests.The experimental results show that the float installed in front of the breakwater is in the resonance state when the incident wave period is close to the natural period of the float,during this time the average output power and conversion efficiency of the wave energy device are the highest,up to 0.05 W and 17.9%,respectively.When the incident wave period is larger,the energy conversion efficiency is lower than those under incident waves of smaller periods,though the average output power is high for longer waves.Additionally,water depth plays a key role in determining the posture and motion characteristics of the float.This study finds that,the average output power and energy conversion efficiency are more satisfactory when the water depth is 60 cm.