In 08/01/1966, Cuc Phuong national park was established by decision No.18-QDLN of Forestry Head Department. When national park was estblished, local people impacts to ecosystem in national park is not serious although local people was subsidiary to nature resources. But from 1976-1986, management and protection activities were become complicated and had many difficulties because population in park increased quickly. Cuc Phuong national park management board has a plan to adjust population in national park core zone, move some communes to outside national park. This plan was one of project that was solved difficulties of ecosystem protection acvivities and improved local people life quality. The article focuses on the study progress and assessment of the effectiveness of moving population out from the Cuc Phuong National Park in terms of economic, social and nature conservation.