Abstract: The quality of the ecological environment in Poyang Lake region hold special significance for the ecological functions and biodiversity protection to Poyang Lake-an important wetland and ecological area over the world. Based on the remote sensing image data of Poyang Lake region in 1995, 2005, and 2015, this paper uses the InVEST model to analyze the temporal and spatial evolution of the habitat quality around the lake region; then calculating and analyzing the probability density function and cumulative distribution function of habitat degradation by pixel dichotomy for ascertaining the threshold of habitat degradation in the lake region; finally discussing the changes in habitat quality advantages of different ecological types with standard deviation ellipse analysis method. The results show that: （1)The construction land and water in Poyang Lake region increased significantly from 1995 to 2015; while the cultivated land, the grass land and the forest land decreased slightly.（2)The strong disturbance thresholds of cultivated land, woodland, grass land and water habitats in Poyang Lake region are 70%, 85%, 81%, 78% of their respective habitat suitability. The disturbance of waters, woodlands, and grasslands is getting stronger, while the disturbance of farmland is getting weaker. （3)Habitat quality in Poyang Lake region declined slightly from 1995 to 2015. The waters in the central area and the woodland in the northern area have weaker interference, higher regional habitat quality is mainly distributed in these areas; the outer edge of the central area has average habitat quality; while the cultivated land in the southwest has strong interference and the habitat quality of the region is low. The evolution from high-quality habitats to low-quality habitats is severe. （4)The change of cultivated land reflects the strictness of the protection policy to cultivated land; the change of forest and grassland is affected by topographic gradient factors; and the change of waters is affected by the combination of lake reclamation and urban expansion, which reveals the limitations in explaining the evolution of wetland water habitat quality only in the land use level. The research results have certain theoretical significance and practical value for the ecological environment protection and ecosystem regulation of Poyang Lake region.