Abstract:The widespread application of Urban Green Infrastructure (UGI) continuously reshapes the global urban landscape and significantly impacts urban ecosystem services. As an inland basin city adjacent to the western Sichuan Plateau, Chengdu’s urban landscape differs considerably from that of other cities in China in terms of the diversity of UGI composition. This article conducts a comprehensive investigation centered on the urban landscape of Chengdu, utilizing geographic information systems, ecological service modeling, and spatial analysis to quantify the profound impact of UGI on ecological services. A systematic approach is adopted to integrate UGI into planning recommendations for optimizing urban ecosystem services, providing specific solutions for optimizing the spatial layout of UGI in the main urban area of Chengdu during rapid urbanization, especially for improving biodiversity hotspots. The study summarized three key trends: (1) Significant changes in land use in Chengdu, characterized by a significant reduction in green space in urban areas and a significant expansion of construction land, have been mainly attributed to population growth and changes in land use patterns. (2) The investigation and analysis of spatial clustering hotspots and cold spots reveal that most of the temperature cold spots in the main urban area are in the eastern part of Chengdu, while the highest concentration of hotspots based on their value is in the southern region. (3) The analysis of carbon density within UGI indicates that the peak of ecosystem service concentration occurs in the central urban areas.