The deep sea is increasingly recognized as a major global reservoir of the earth's biodiversity.The deep sea bottom fisheries represented by bottom trawl and their impact on the vulnerable deep sea ecosystems,including seamounts,hydrothermal vents and cold water corals,are fervently concerned by international community in the past ten years.General Assembly of the United Nations has approved a series of resolutions about biodiversity protection of the vulnerable marine ecosystems since 2002,and called upon all countries since 2004,individually or through regional fisheries management organizations or arrangements,to take actions immediately,and to be consistent with the precautionary approach and ecosystem approaches,to assess whether individual bottom fishing activities would have significant adverse impacts on vulnerable marine ecosystems,and to ensure that these activities which would have significant adverse impacts,are managed to prevent such impacts,or not to be authorized to proceed.The Food and Agriculture Organization of the United Nations provided international technical management standards and policy framework to regulate deep sea bottom fisheries and to protect the vulnerable marine ecosystems in high seas in 2008 International Guidelines for the Management of Deep-sea Fisheries in the high seas.Regional fisheries management organizations or arrangements are implementing and enforcing the rules as above to manage the bottom fishing activities.New regional fisheries management organizations or arrangements with the competence to regulate bottom fisheries and the impacts of fishing on vulnerable marine ecosystems are being established.In North Atlantic,Mediterranean,South Pacific and Antarctic,measures such as the interim prohibition of bottom trawling in some waters,fisheries and ecosystem data collection for assessment of vulnerable deep sea ecosystems and the impact by deep sea bottom fisheries,have been taken by the relevant fisheries management organizations.In North Pacific,a group of nations have agreed to a treaty that establishes conservation strategies for the most vulnerable ecosystems in international waters of the North Pacific Ocean.The NGOs such as the Deep Sea Conservation Coalition and some scientist are calling on a ban on the deep sea bottom trawl fishing in high seas,while various countries take different positions on that and the commercial fishing industry opposes to closing of the bottom trawl fishing.In the opinion of this paper,the deep sea bottom fisheries would not be closed completely in high seas in the short run,but would be closed in more and more waters in high seas.In the future development of China's oceanic fisheries,the status of the management of bottom trawling should be concerned closely to support decision-making,and for prevention of significant adverse impacts on vulnerable marine ecosystems,selective fishing gear and ecologically sound fishing methods should be developed and used.