To analyze the wave transmission characteristics of combined closed-pile breakwater,we carry out physical model test to take the multi-factor analysis on wave transmission characteristics of the new structure based on the relevant existing research.On the basis of model test results,we obtain the fitting formula of wave transmission coefficient on the breakwater with the combined closed-pile foundation.The results show that measures of adding inter-pile rib plate and post-pile panel have remarkable effect on reducing the wave transmission coefficient,especially that the inter-pile rib plate can obviously reduce the wave transmission coefficient of the breakwater with closed-pile foundation with small relative pile spacing.