Abstract: The development of urbanization is closely related to the ecological environment. The dynamic monitoring and analysis of the coupling coordination degree of urbanization and ecological quality can be accurately carried out by using remote sensing method, so as to provide necessary reference basis for regional urbanization construction, ecological governance and development planning. Taking the Yangtze River Delta urban agglomeration as an example, this paper uses Landsat series data and DMSP/OLS night light data to establish the remote sensing ecological index (RSEI) and the light index (CNLI) representing the regional ecological environment respectively. Using the coupling coordination degree model to monitor and analyze the change of the coupling coordination degree of urbanization and ecological environment of the Yangtze River Delta urban agglomeration from 2001 to 2018 in this paper. The results show that: ① from 2001 to 2018, the urbanization level of urban agglomeration in the Yangtze River Delta continued to improve, and the urbanization index increased from 0.112 in 2001 to 0.288 in 2018. ② From 2001 to 2018, the eco-environmental quality of urban agglomerations in the Yangtze River Delta was declining, and the regions with excellent ecological grade were shrinking, especially in Shanghai and Nanjing division. ③ From 2001 to 2018, the coordination degree of urbanization and ecological environment of cities in the Yangtze River Delta urban agglomeration generally showed an upward trend, and the coordination degree of urbanization and ecological environment of cities varied greatly in space.

Key words: light index, remote sensing ecological index, coupling coordination degree model, Yangtze River Delta urban agglomeration