Natural tourism resources are a core factor for developing ecotourism in national parks. However, this type of resource is always the target of many people, and is vulnerable to the negative impacts of tourists and natural changes. To ensure the integrity of natural tourism resources, many measures need to be implemented synchronously. Using the methods of document research and field observation, the ressults show that the U Minh Thuong National Park Management Board actively prevents forest fires; prevent illegal forest intrusion by local people; rescue wildlife; clean environment; promote scientific research activities; inpterpret/educate environment; protect peat layer to preserve local natural tourism resources. Applying the questionnaire survey method, the results show that the conservation of natural tourism resources in the National Park is evaluated well; the better the conservation of natural tourism resources, the higher the attractiveness of the National Park; tourist satisfaction and loyalty increase the better the natural tourism resources in the National Park are preserved.