The purpose of this paper is to develop the optimal evaluation model for the environmental management of domestic seaports which are faced with the reduction of greenhouse gases because of the effectuation of Paris climate agreement, also evaluate the optimal evaluation model by the environmental managers of 11 regional offices of Ocean and Fisheries who participated to the evaluation through the website which are constructed newly. The main results of this paper are as follows. First, the European evaluation models (SDM, PERS, EMS, TEIP and TEAP) by ESPO, American model(EMH) by AAPS, Japanese model by Japanese Law of ports and harbours, Guidelines of Environmental Aspects Survey in Seaport Area by Korean Ministry of Oceans and Fisheries are used. Second, optimal evaluation model consists of followings: air quality, energy consumption, noise, water quality, operation of dredging, earth and sand, port waste, land related port development, relationship with local community, ship’s waste, climate change, port environmental policy, operation, organization, port environmental training, cargo loading and unloading, and port security environmental management. Third, the number 2 of regional office of oceans and fisheries shows the top ranking in the port environmental management. Air quality which is the most important item of the climate change was not managed in the domestic ports. Fourth, website address for environmental evaluation is http://www.chosun.ac.kr/~nkpark.The policy implication is that Korean seaport authority should introduce the specific port environmental management plan to cope with the Paris climate change agreement.