The research aims to study the importance of environmentally friendly contract management factors in public construction projects and establish standards for contract management guidelines in environmentally friendly public construction projects under the Procurement and Supplies Management Act of 2017. The study focuses on large-scale public construction projects in Bangkok Metropolitan area and its vicinity. The research methodology involves the use of questionnaires and interviews, and data analysis is conducted by calculating the Relative Importance Index (RII) to rank the factors affecting contract management. The most significant factors influencing contract management, in order of importance, are as follows: 1. Modifying or Changing Format of the List. RII = 56.551% (Procurement and public procurement management) 2. Prevention of air pollution from dust and construction materials. RII = 50.924% (Environmentally friendly building construction) 3. Labor shortage. RII = 63.229% (Risk management in construction) Additionally, there are guidelines for mitigating the impact of construction contracts on the environment. Contract management model for government construction projects environmentally friendly, sustainable investment for long-term development of green construction projects, effective management of local issues and conflicts during construction, and the management of wastewater and air pollution to minimize environmental impact. The focus is on cost-effective and timely construction of green buildings, aiming to create projects that are valuable in all aspects.

construction contract management, environmentally friendly construction, government construction factors, environmentally friendly construction.