To summarize and promote the design experiences of supporting terminals for ethylene projects,taking the design of supporting terminals for 1 million t/a ethylene project in Hainan Refining&Chemical as an example,the key technical problems that need to be solved in this engineering design include: the problem of multiple types of loading and unloading cargo,multiple types of ship types and large spans,transportation guarantee for major items during construction,hydraulic structure design under complex geological conditions,and foundation design for process pipe racks on deep riprap embankment.By analyzing the ship type and geological conditions,optimizing the loading and unloading process and overall layout,and innovating structural design,the key problems are effectively solved.