Studying on the wave force of the circular lamp pile structure of the sloping breakwater is great significance to the design and stability of the breakwater.Based on the physical model tests in a wave flume,we analyze the time variation of wave pressure at different positions,the distribution of wave pressure on the structure surface,and the synchronous wave pressure distribution characteristics at each measuring point when the horizontal force or vertical force is the maximum.We also compare the experimental results of the wave force with the results calculated by the standard about the vertical chest wall.The results show that the wave pressure in the non-shielded part is mainly the combination of the impact pressure and the gradually varying pressure.The wave pressure in the shielded part shows the slowly varying pressure.From the top of the lighthouse to the bottom of the lamp pile foundation,the wave pressure increases first and then decreases with the relative height decreasing.When the water level exceeds a certain height of the structure and the structure is protected by block,the wave pressure at the low part is approximately uniformly distributed,but without protection,the maximum wave pressure occurs at the maximum of horizontal force.When it is partly protected,the wave horizontal force of the lamp pile structure is smaller than that under no protection,but larger than that with a full protection.Based on code of hydrology for sea harbor,the correction coefficient and fitting formula are obtained，which can calculate the wave horizontal force of this structural type on sloping breakwater.