Abstract: Benefit maximization is the eternal theme of production and management of international oil companies. Oil and gas production is the carrier of benefit realization, and improving the production efficiency is the inevitable way to maintain and increase the value of overseas assets. In view of the current series of practices of domestic companies to improve the quality and efficiency of overseas projects, it is urgent to establish a set of comprehensive benefit and output optimization methods that can be compatible with oil price shocks, adapt to the characteristics of overseas projects and meet different needs, so as to help improve the quality and efficiency of overseas projects. Based on the characteristics of overseas projects and taking into account both profitability and risk, this paper creates a multi-dimensional multi-objective decision-making model of full benefit and designs a solution algorithm. Under the constraints of investment, cost and block, and considering multiple decision-making objectives such as production, profit and risk, this paper presents a full-dimensional optimal decision-making interval for the development of overseas oil and gas field projects. The model was applied to specific cases of overseas oil fields, and the uncertainty analysis of project output, oil price, cost and investment etc. by scenario was taken into account. Good application results were obtained, and reliable decision support was provided for the formulation of benefit output optimization scheme and high-quality development of overseas oil fields.