The project of berth No.1 to No.3 in Kemen port,Luoyuan bay,Fuzhou,has a high grade of structure,and it has typical problems such as a great variety of buried depths of geologic rocks,and the complexity and limitations of the surrounding construction condition.Based on the determination of the width of the trench excavation,the design of the step profile excavation and the technical requirement of the heavy tamping,etc.,this paper provides a support for similar projects on the optimization design of the trench excavation width,the design of the step profile excavation and the technical index of the heavy tamping.