Abstract: In order to alleviate the contradiction of development and protection between Natural Preserve and Beidaihe New Are,achieving coordinated development of regional economies,Changes in habitat and biodiversity were studied during 1999~2011,and Changes in population and distribution of Amphioxus which was the main object of protection were studied as the basis for Scope and function adjustment.Moderately expanding the scope of Amphioxus habitat,gradually recovering its population and habitat,enhancing biodiversity conservation,maintaining the health of marine ecosystems were as the target of adjustment.With a pragmatic,law enforcement and facilitating management as the principle of adjustment,Carried out marine environment and resources survey and adjustment demonstration research.Adjusted water area is 224 km2,compared to the previous adjustment increased by 7%.The core zone is 95 km2,compared with adjusted pre- expanded 36%; waters buffer zone is 129 km2,compared to the previous adjustment reduced by 7%.The managmentability will be strengthened by the scope adjustment,also it can contribute to protecting ecosystems and protected object.