This paper takes an oil and gas terminal’s bidding project in Mediterranean as an example.In view of the characteristics of large waves,multiple berths,complex conditions,limited water area space,high requirements for downtime,and multiple uncertainties,this paper studies the core issues such as the arrangement of breakwaters and multiple berths layout in narrow space,as well as the channel layout under the uncertainty of single-point mooring operations outside the channel entrance gate.This paper uses the methods such as numerical simulation of waves and currents,ship maneuvering and mooring tests to determine the scientific,economic and reasonable general layout scheme through the research and demonstration of multiple schemes.This paper proposes and summarizes the main ideas and design experiences for the general layout of overseas budget-constrained design projects,which can provide references for similar projects.