Abstract: Objective This study aims to promote the coordinated and sustainable development of regional forest eco-nature-economic-society complex system. Method Based on 28 indexes data of the forest ecology-nature-economy-society complex system in Changsha City from 1980 to 2020, the coupling degree and coupling coordination degree of the regional forest ecology-nature-economy-society complex system were measured and analyzed by using entropy model, coupling degree model and coupling coordination degree model. Result From 1980 to 2020, the coupling degree of forest ecology-natural environment-economy-society complex system showed an "inverted U shape", with an overall upward trend. In Changsha City, the coupling coordination degree between forest ecosystem, natural environment system and social system showed an "S-shaped" increasing trend year by year, and the coupling coordination degree between forest ecosystem and economic system showed an "N-shaped" trend, with first increasing, then decreasing and then increasing again. However, after 2015, the rising trend of the coupling coordination degree of all systems slowed down. Conclusion From 1980 to 2020, the coupling coordination degree of the forest ecosystem-natural environment-economic-social complex system and its subsystems is not high. At present, it is mainly at the moderate coordination stage, basically in the transition period from moderate coupling coordination to high coupling coordination, and there is still a lot of room for improvement. From 1980 to 2020, the coupling coordination degree of forest ecosystem-natural environment-economy-society complex system and forest eco-system with natural environmental system, socio-cultural system and economic system in Changsha City has increased to different degrees, but the rising trend has slowed down. It is suggested that the coupling and coordination degree of regional forest ecosystem should be improved from three aspects: constructing fine natural environment subsystem for regional forest growth, establishing high-quality and sustainable economic development subsystem, and building social subsystem for supporting reasonable and green consumption, to realize the sustainable development of regional forest ecology-nature-economy-society complex system.

Key words: composite system, coupling coordination degree, measure, Changsha