Based on the three-dimensional index system and panel data of 41 cities in the Yangtze River Delta (YRD),this paper measures the green and low-carbon cycle development index of the YRD using the principal component analysis. It reveals the dynamic evolution regularity and rank change characteristics of the green and low-carbon cycle development in the YRD by the means of the Kernel density method and the Markov transfer probability matrix,and uses the coupling coordination degree model to evaluate the interconnection of its subsystems. It's found that: 1) The level of green and low-carbon cycle development in the YRD region as a whole is on an upward trend,and the order of the subsystem indexes from high value to low value is cycle development, low-carbon development,green development respectively. The level of green and low-carbon cycle development in Shanghai is the highest,followed by Zhejiang,Jiangsu and Anhui. 2) The level of green and low-carbon cycle development in 41 cities of the YRD shows the radiating characteristics,which is from central cities to peripheral cities and driving the gradual improvement of the peripheral cities. There is a possibility of multi-level leapfrogging in the green and low-carbon cycle development of the 41 cities and the rigidity of the change is not strong,so it is not easy to produce the "Matthew Effect". The inter-provincial gap in the level of green and low-carbon cycle development of the YRD is relatively small,but the gap between the cities tends to widen. 3) The coupling degree of green and low-carbon cycle in the YRD region is high,but the highest level of coupling coordination is 0.523 (belonging to the primary coordination). Based on the above conclusions,to further enhance the level of green and low-carbon cycle development in the YRD region,it should make up for the shortcomings of green development,optimize the long-term effectiveness of the government's ecological and environmental governance,and strengthen the efficient synergy of regional ecological governance.
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