For the rubble mound breakwater in deep water,the influence of the property of the core stone on the irregular wave propagation is studied in the way of physical model tests.The external regularities of the irregular wave are analyzed statistically,then the relations between the transmission coefficient of the breakwater,the period and the height of the incident wave,and the weight distribution of the core stone are discussed.Taking these dimensionless parametersHi/d,gT2/d and B/D50 into account,the irregular wave transmission coefficient empirical formula is put forward which is applied to irregular waves,so it can provide some reference for engineering practice of breakwaters and research.