Relying on the actual project，we carry out the physical model test on the wave-eliminating characteristics of the permeable dike with baffle pile foundation，optimize the dike structure，and apply the previous research results. The results show that for breakwaters that are greatly affected by waves，the transmission coefficient behind the dike is related to the waves over the top of the dike and the seepage of the waves at the bottom of the dike，and it is necessary to consider the factor of waves over the top of the dike in the calculation. When optimizing the design of empty dikes，the wave-eliminating characteristics can be enhanced by increasing the water penetration depth of the wave breaker or increase the elevation of the top of the dike or adjusting both at the same time. It is recommended to use Wiegel formula to estimate the wave transmission coefficient of permeable dike with single-baffle pile foundation. Each formula has its own applicable conditions and the targeted structure is relatively simple，there are errors when it is applied to actual projects，and it is necessary to analyze the environmental characteristics and structural design characteristics of different projects，and reasonably select formulas for calculation.