Taking Erhai Basin as the research area,with the help of Google Earth Engine cloud platform and Landsat 8 OLI series im-ages,the enhanced index-based build-up index(EIBI)of the research area was synthesized and the built-up areas in Erhai Basin was extracted.Then,the remote sensing-based ecological index of the study area was synthesized.Through the spatial correlation anal-ysis of the remote sensing-based ecological index of the built-up area and the basin,the ecological assessment of Erhai Basin and its built-up area from 2014 to 2021 was carried out.The results showed that the EIBI could effectively enhance the building information.Using EIBI could effectively and accurately extract the built-up area of the study area.After EIBI extraction,the expansion area of the built-up area of Erhai Basin from 2014 to 2021 was 14.712 km2.From 2014 to 2021,the ecology of Erhai Basin was significantly im-proved,the remote sensing ecological index increased by 0.008,with an increase rate of 0.001/year,and more than 65％of the region-al ecology in the basin was improved.The built-up area in Erhai Basin roughly matched the area where the ecology had not been im-proved.The ecological quality of the built-up area had not been significantly improved after ecological restoration,and the ecological quality of the built-up area showed a downward trend year by year,indicating that the built-up area had resistance to environmental improvement.
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