Law on Promoting Green Purchasing was enforced on 2001. This paper studied the existing state of the Green Purchasing associated with the Law, for public works of port and airport construction. Then the key point of the promotion of procurement of eco-friendly goods and materials by the State and other is considered. This paper presents, as a supporting tool for promotion of Green Purchasing, guidebook of eco-friendly goods and materials for port and airport construction use and reported cases of Green Purchasing of eco-friendly goods and materials.