Abstract: Based on the construction of the evaluation index system of land use benefit and ecological environment level, the weight of variation coefficient method is used to determine the weight, and the coupling coordination model is combined to reveal the time and space changes of coupling degree of land use benefit and ecological environment level coupling between Chengdu and Chongqing urban agglomerations from 2006 to 2016. The results show that the land-use benefits of various cities in the Chengdu-Chongqing city cluster show a gradual upward trend, the growth rate slows down year by year, and the internal differences are significant. The eco-environment level of various cities has basically shown a year-on-year growth trend, and a small number of cities have begun to decline after 2011. The coordination between the land use benefits and the ecological environment of the Chengdu-Chongqing city cluster needs to be strengthened. Most cities are in a state of maladjustment throughout the year, mainly with moderate and imminent disorders. The spatial variation of the coupling degree shows a trend of rising from Chengdu to the northeast of the urban agglomeration and then to the southeast.

Key words: Chengdu-Chongqing city cluster, land benefit, ecosystem, coupling