关键词: 可持续经济规模, 生态服务价值, 生态价值, 脱（复）钩指数, 南疆四地州

Abstract: The pursuit of highquality economic and social development and optimization of the supply side structure has been the main direction of national strategic development, exploring how to meet the needs of human development and sustainable development without damaging the ecosystem is a problem that human society must face and need to be solved. Based on the interaction mechanism framework of sustainable economic scale and ecological service function, this paper analyzed the changes of the overall ecological service value (ESV), ecological service pressure index (S), ecological service output capacity index (P) and sustainable economic scale (GDPc) of the four prefectures in Southern Xinjiang by using the decoupling theory. The results showed that: ESV of the four prefectures in Southern Xinjiang increased firstly and then decreased, reaching the maximum value in 2015 and starting to decline in 2020. From 1990 to 2015, the economic development of the four prefectures in Southern Xinjiang had little impact on the ecological environment. After 2015, the negative impact of economic development on ecological resources gradually emerged. The economic development and ecological environment of the four prefectures in Southern Xinjiang were in a decoupling state before 2000, and fluctuated from 2000 to 2015, and the decoupling state was most significant in 2020. The GDPc of sustainable economic scale of the four prefectures in Southern Xinjiang increased firstly and then decreased. Since 2015, the phenomenon beyond the sustainable scale has become more and more serious, and the contradiction between economic society and ecological system has become increasingly prominent. On the whole, economic growth, population increase and industrial efficiency improvement not only promote economic and social development, but also mean that human beings demand more from the ecosystem. The fragile ecological environment of the four regions in Southern Xinjiang cannot bear the rapid economic development. We should be aware of the fragility and irreversibility of the natural environment when considering the promotion of economic and social development, otherwise， economic and social development will be severely restricted by the value of ecosystem services.

Key words: sustainable economic scale, ecological service value, ecological exergy value, decoupling theory, four prefectures in Southern Xinjiang