ABSTRACT Problems of environmental pollution in the port, and the users’ ignorance to environmental protection cause the inevitable pollution around the harbor. In order to achieve sustainable development, establishing and promoting the Green Eco-Port become the new trend for harbors. This research tries to sort out the causes of the pollution within the context of environmental treaties and relative documents in the beginning. Based on the management patterns adopted by the foreign corporations for the development of Green/Eco-port, this paper aims at the construction of harbor pollution evaluation criteria by the gray relational analysis, and then sorts out the degree of the pollution. In conclusion, we categorize pollution causes for environmental pollution in international harbors. Based on the aforementioned ideas, authorities and stakeholders can develop and draw up protected policies and strategies for environmental pollution prevention in international harbors.