Abstract: The big wave of land reclamation nowadays is mainly caused by the great gap between the price of the land reclaimed from the sea and the land. The economic benefit of reclamation should be considered from the overall situation with the vision of development. In other words, it should be not only estimated from the price difference of the cost between land and land reclamation, but also other factors such as the economic loss generated by marine and land environment impact, which the excessive quantity of earth-rock and the maintenance expense after the reclamation project should be taken into account. The reclamation area should be smaller than the reclamation area of rising benefit limit. Land reclamation especially reclaimed in rather deep waters, for a large area,
would lead to negative economic benefit.