As construction becomes greener, people have higher and higher requirements for engineering project management, which
makes it necessary to deeply study the comprehensive optimization of schedule, cost and sustainability level. Adhering to
the concept of low carbon and green, the article takes carbon emission factor into the total cost of building construction and
improves the traditional cost objective of engineering projects; then quantitatively analyzes the economic, environmental
and social impacts of assembled buildings from the perspective of sustainability, and introduces the sustainability objective
into the traditional duration-cost problem study, taking the duration of each job in the double code arrow diagram as the
independent variable to construct the duration -cost-sustainability level multi-objective optimization model. In order to solve the
type effectively, a series of Pareto optimal solutions are obtained using the NSGA-II algorithm, and the efficacy coefficient
method is used for program decision making. The results show that the Pareto solution set can provide effective support for the
project manager’s decision making, and the NSGA-II algorithm is effective in solving the multi-objective optimization model.