Abstract: The habitat quality of the green infrastructure in Yongding district was evaluated by the InVEST habitat quality model,which based on the land use data of Yongding district in2017 and combined with the spatial analysis function of ArcGIS software.The results showed that the overall green infrastructure in Yongding district was well maintained.However,because of the deeper urbanization,the construction land continues expanding,and the farmland was reclaimed in disorder,resulting in the degradation of habitat seriously and the quality of habitat poorly around the urban area of Yongding district and its rural area nearby.Human activities were the main factor of ecological change.Taking the evaluation and analysis about the change of habitat quality in Yongding district,the purpose was to provide scientific basis for ecological protection,coordination of the contradiction between ecology and development,and prevent the ecological damage of green infrastructure.

Key words: Yongding district, InVEST model, green infrastructure, habitat quality assessment