Abstract: As a key strategic pivot driving the coordinated development of the Yangtze River Economic Belt and a core engine spearheading the rise of central China,the Changsha-Zhuzhou-Xiangtan Metropolitan Circle faces heightened ecological demands due to its rapidly expanding regional economy.Scientifically evaluating its ecological quality serves not only as a practical embodiment of the "lucid waters and lush mountains are invaluable assets" concept,but also as a significant innovation in exploring synergistic models for new urbanization and ecological civilization construction.This study integrates multi-source remote sensing imagery and ground-based measured data to establish an integrated "space-air-ground" monitoring network.Strictly adhering to the Technical Criterion for Regional Eco-Environmental Quality Evaluation (Trial),it comprehensively deconstructs and analyzes the current status and dynamics of ecological quality within the metropolitan circle across four core dimensions: ecological pattern,ecological function,biodiversity,and ecological stress.The study found that in 2024,the ecological quality index of the Changsha-Zhuzhou-Xiangtan Metropolitan Circle was 65.35,classified as Grade II,indicating a sound ecological foundation.Among the county-level evaluation units in the study area,the proportions classified as Grade I,II,III,and IV were 10.5%,36.8%,47.4%,and 5.3% respectively,with Grade I and II areas covering a substantial 84.6% of the total area.Meanwhile,the regional ecological quality exhibited distinct spatial heterogeneity,with urban built-up areas exhibiting poorer quality compared to surrounding counties.Since 2020,six counties in the region have experienced slight improvements in ecological quality,covering 12.21% of the area,while ecological quality remained essentially stable in 13 counties,accounting for 87.79% of the region.Overall,the ecological quality of the area demonstrates a trend of stability with slight improvement,continuing to move in a positive direction.