By the physical model test，we research the influence of cushion layer mass on the stability of sloping dike. We choose 1/20~1/10，1/40~1/30，1/60~1/50，1/100~1/90 of the stable mass of the twist Wang block as the cushion layer mass，research the influence of irregular wave on the stability of sloping dike （including effluent dike and submerged dike） under the same experimental conditions，and record the test process by video recording and shooting. The results show that effluent dike and submerged dike with the cushion layer mass of 1/20~1/10 and 1/40~1/30 have the similar stability of the sloping dike，and the stability of the two dikes can maintain under the calculated stable wave height，only slight instability occurs under the extreme wave conditions. And in the other two cases，the structural stability of the dike body is poor，resulting in the deformation of the dike body，the subsidence of the embankment top，the run-out of the cushion layer，the instability of the twist Wang block and other forms of damage. Compared with the sloping dike of two elevations，the stability of submerged dike is much better than that of the effluent dike with the same mass of cushion layer.