Abstract: Mountains are important components of China's territorial space, especially due to climate change, which is impacted in both scale and degree by human activity. Mountain ecosystems are affected by both natural and human disturbances and their effects are magnified by climate change. It is important to focus on the health of mountain ecosystems due to changes in land use. Changes in the quality of mountain habitats can also reveal the fragility of mountain ecosystems and preferably provide a scientific basis for ecological restoration. In this study, GIS software was used in conjunction with the InVEST model to analyze land-use data based on 30 m resolution calculated for the period 1980-2018 to assess changes in the quality of the habitat in the Dali Bai Autonomous Prefecture. The results of the analysis show that the quality of Dali Bai Autonomous Prefecture's habitat was above 0.700 and was generally improving. However, the habitat of about 20% of the study area was of a poor or relatively poor quality; 3.298% of the area's habitat had deteriorated from relatively poor grade quality to poor grade quality; and 3.752% of the area’s habitat had deteriorated from excellent or good quality to poor or very poor grade quality. The spatial change in habitat quality was remarkble. The region that had improved was mainly distributed in the marginal mountainous areas of the prefecture, while the areas that had deteriorated were mainly distributed in the plain areas, the gentle slops along the river, and around the town of the plain areas. Measures such as promoting "Grain for Green Projects", tourism, and highland special fluit plantations, etc. would be useful for the optimization of the quality of habitats of the Daili Bai Autonomous Prefecture. Furthermore, urban development at gentle mountain slops has led to the deterioration of the quality of habitates in the study area. So that, attention should be paid to those issues to prevent a further decline in habitat quality. It is equally important to promote both the relocation of towns to higher sites and the restoration of the land space.

Key words: Dali Bai Autonomous Prefecture, habitat quality, space of national land, InVEST model