In the case of the inclined breakwater covered, the wave force acting on the parapet is reduced. China's "Breakwater Design and Construction Norms", there is stipulation on the calculation of the parapet, when the parapet before the cover and cover the width and height of 2 rows of 2 layers of dolosse, the wave force on parapet can be multiplied by the reduction factor 0.6～0.7, But for parapet is full of accropode, large stone blocks and other surface protection, the wave force reduction is not described. In this paper, physical model test, the wave force acting on the parapet under different wave parameter and filled with accropode and large stones are measured and compared with the results of the current code. The results show that: In the case of full accropode and large stone, the wave force reduction coefficient of 0.8 is more suitable. It can be used for reference for design.
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