This study examines current problems relating environmental pollution at Khanh Hoa marine ports and does, therefore, propose solutions to their problems. Evidence shows the reality of these marine ports' environment, management issues and impacts of these marine ports' environment on Khanh Hoa social economy. Cost estimation is applied for these ports environmental protection and, in return, assessment their gains in terms of social economic efficiency. In addition, the study has raised high urgency on sustainable marine ports development. Even though protecting these marine ports does not, in terms of economic value, create short-run profits, whereas, in terms of social welfare and social responsibility, it can make long-run profits and become a mission needed to perform. The study raises the pollution environmental problems in marine port has to be fixed and developed urgently. Even the protection of the marine port not related to economic value or create a short run profit, whereas, in long run profit it would be for social welfare and social responsibility.