Abstract: Based on the coupling coordination model, we constructed an evaluation index system of three subsystems including ecology, economy, and society in the Gansu section of Qilian Mountain National Park. The evaluation indices were selected according to the respective development characteristics of the three subsystems, and the statistical data from 2011 to 2020 were analyzed. The entropy method was used to calculate those indices. The coupling coordination degrees were calculated to analyze the development of the three subsystems. The results showed that the ecological, economic and social subsystems affected each other, were highly correlated, and had a high degree of coupling. They were basically at a high-level coupling state. According to the calculations of comprehensive evaluation value, the development of the ecological subsystem declined first and then rose, while the economic and social subsystems showed a steady rising trend. Gradual improvement of the ecological subsystem was closely related to the implementation of national park policy. The coordination degrees of the three subsystems have been improved steadily, and experienced four stages, including the verge of maladjustment and decline, primary coordinated development, intermediate coordinated development, and good coordinated development. Therefore, the national park plays an important role in protecting the local ecological environment and promoting economic and social development.

Key words: coupling coordinated development, economic subsystem, ecological subsystem, social subsystem, Qilian Mountain National Park.