Aiming at the problem of wave dissipation performance of a new type of permeable breakwater of double porous inclined baffle,we study the influence of the baffle opening ratio and the baffle angle on the wave dissipation performance of the breakwater.Through the physical model test,we obtain the results of the reflection and transmittance coefficients,wave energy distribution and spectrum characteristics of wave amplitude behind the breakwater.The results show that the larger the opening rate of the inclined baffle is,the larger the transmittance coefficient of breakwater will be.Within the test range,the transmittance coefficients are all less than 0.5.This type of breakwater has better energy dissipation for waves,it is mainly reflecting for long period wave,it is mainly dissipating by wave-absorbing chambers for short period wave,and the overall transmittance coefficient for short period wave is slightly larger.In addition,the design of the inclined baffle of the breakwater has a smaller transmittance coefficient than the flat baffle,it has better wave dissipation performance,and the minimum transmittance coefficient is only 39% of the latter.