The land formation engineering of the steel project in Fangcheng port adopts a large area of land reclamation, which will have influence on the tidal prism of the Fangcheng bay and the marine environment. Based on the comparison and analysis of the reclamation area and the tidal prism, this paper proposes the optimal design scheme of the land bench edge, and studies the factors shall be considered for the design of the land bench edge under similar bay mouth position and natural conditions.