Being used to calculate the foundation stress, the method of actual criterion assumes that the rubble bed is rigid. Although it refers to the weight of the rubble bed and the stress on the top, the earth pressure in front and at the back of the rubble bed are not considered. With the development of the great gravity wharf, the depth of rubble bed increases, so the earth pressure in front and at the back of the rubble bed also increases. Hence, there must be some differences between the criterion method and the actual situation. The paper analyzes the effect of the earth pressure on the distribution of foundation stress by systemic study and calculation. According to the result of engineering FEM program PLAXIS, a more rational method with three controlling points is put forward.