Abstract: Green livable villages and towns are one of the general requirements of the rural revitalization strategy. Aiming at the problem that the early decision-making of green and livable villages and towns construction projects is not green and scientific, and it is difficult to coordinate multiple goals. This article first takes government investment projects as an example, starts with the factors influencing multi-objective decision-making, and uses grounded theories to construct the ‘environment, resources, economy, society, information, and risk’. Then, based on the cost-benefit evaluation and improved TOPSIS analysis under environmental constraints, a three-stage decisionmaking model for government agencies is constructed. Finally, a case analysis is carried out to verify the feasibility of the model. The results showed that after considering the rigid constraints of environmental costs and the currency quantification of environmental and social indicators, the project was either rejected by one vote or ENPV, EIRR, and B/C were all reduced to varying degrees, which proved the importance of environmental goals. Combining cost-effectiveness with Improved TOPSIS analysis of cost-effect indicators, it fully demonstrates the comprehensive benefits of the project, promotes multi-objective coordination, and provides reference for multi-objective decisionmaking in green and livable villages and towns construction projects.