Based on the structure of sloping submerged breakwaters under the wave load,and from the point of velocity potential function and momentum principle,a simplified calculation method for solving wave forces of sloping submerged breakwaters under wave load is analyzed,and the detailed calculating method and steps are presented.Moreover,the comparing analysis between the calculation result of the simplified calculation method and the results of the fluent analyzed method is carried out.The outcome shows that the simplified calculation method is an exact and valid method.