The theme for World Maritime Day 2016 is "Shipping:indispensable to the world." which highly summarized the relationship between the shipping industry and the world economy. As a bridge of the international trade, the shipping industry connects more than 90% of the world's goods, however, it also brings about some marine environment problems while boosting the rapid development of the global economy.All kinds of aquatic organisms and pathogens carried by ballast water have potential destructive effects on the ecological environment of the port waters, according to statistics, more than 7 000 species are transported tothe new areas by ballast water every day, there are some pathogenic bacteria andalgae in ballast water. The invasion ofthese non-indigenous speciescould destry the ecological balance of the local waters, and then have a great effect on the diversity of marine organisms, moreoverendanger fishery resources and even the health of local residents.At this point, a series of international conventions have been developed, such as the United Nations' , (2005), etc, includingthe (hereinafter referred to as BWM Convention) developed by the International Maritime Organization (IMO), whichhave already entered into force in September 8, 2017.This paper combines the BWM Convention to discuss Regional Ecosystem Risk Assessment of Non-Indigenous Species Transfer via Ballast Water, and then provides a new idea on the ecological environment management for port states.