Abstract: To reduce offshore oil production cost is the goal petroleum companies pursue, while the minimum structure technology is an efficient path to reduce oil field development cost. For more than 20 years, many foreign companies are developing minimum structure to reduce investment, improve efficiency, and develop offshore oilfield efficiently and rapidly. Development cost and time of marginal fields was decreased by 50% compared to those associated with standard four-pile jackets. Therefore, the research and the optimization of minimum structure design have strategic significance to the marginal oilfield's development.