The reinforcement method of suspended breakwater is studied in different construction period and service life.During the construction period,the method of widening with the inside blasting is adopted to reinforce;and the outer sand is added with drainage plate to reinforce during the service period.The stability of suspended breakwater during construction and service period is checked,and it is proved that this method is feasible.Through monitoring the stability of the breakwater to meet the design requirements,it is concluded that the application of this method is successful.