Abstract: The harmonious coexistence of man and nature is an incisive summary of the relationship between man and nature put forward by the Chinese Communists, represented by General Secretary XI Jinping, standing at a new historical node in the new era and carefully reviewing the experience and lessons of historical development. National park is a new type of natural protected area and a kind of natural field, which plays an important role in the construction system of natural protected area in China. Harmonious coexistence between man and nature is the model of environmental ethics that we should following the national park construction. In the practice of national park construction, the modernization of the concept of ecological civilization, the modernization of ecological civilization system, the modernization of ecological civilization technology and the modernization of ecological civilization behavior, are important forces driving the modernization of harmonious coexistence between man and nature, and also a profound display of the connotation of national parks. At the same time, to promote the modernization of the harmonious coexistence of man and nature is the practical turn of the connotation of environmental ethics of national parks under the background of the new journey, and is also the attribution of its practice. On this basis, it is necessary to seek long-term effect and stability maintenance of ecological development.