Abstract: Based on the new tool of LCOE map, by combining the Delft 3 D-FLOW numerical model with the economic parameter LCOE,the resource availability and economy are combined to plan the select location of the tidal power station. At the same time, combined with the changes of LCOE map parameters, the influence of different parameters on the power generation cost of tidal current energy is compared and analyzed. The results show that the southeastern part of Zhaitang island is an ideal area for planning tidal power station.Increasing the power factor and reducing construction cost are important factors to reduce the cost of tidal power generation.