Shuangyu Island is an offshore artificial island for urban comprehensive development,and the land elevation on the island is an independent system.The determination of land elevation concerns planning,safety,revetment,landscape,quantity of land reclamation,cost,flood control and drainage,hydrophily etc.We discuss the main factors that influence the determination of land elevations at reclamation and operation periods,and use Shuangyu Island as an example of case to give an overall introduction on the change trend of land elevation,to analyze the determination of elevation for different parts,and to study on the balance between engineering safety and hydrophily,relationship between elevation and upper planning,optimality principle between elevation and land reclamation quantity or cost.The research results can be used to provide ideas and references for the elevation determination of other similar projects.