The hollow block mound breakwater is quite different from the traditional slope dike in section and block shape. It is difficult to calculate the stable mass of the block using the formula in the specification.To solve this problem，the stability of the hollow block under the conditions of different water levels，different wave heights，and different wave periods under the action of regular waves and irregular waves has been studied through physical models. The test results show that dimensionless stable mass Wr shows a linear increasing trend with the increase of the Irribbarren number. Finally，combined with the research results，a calculation formula for the stable mass of the block considering the influence of wave steepness under the action of regular and irregular waves is fitted. The recommended stability factor is 9.1，and the formula provides a reference for the structural design of the hollow block mound breakwater.