This paper, in order to study impacts of coordinated concentration of manufacturing and industrial servicing on green developing efficiency, uses 27 central cities of Yangtze river delta city cluster as a case to study the impacting degree of coordinated concentration of manufacturing and industrial servicing on green developing efficiency by means of GMM model, with factors threshold effects considered. Single industrial concentration of manufacturing and industrial servicing promotes green developing efficiency, and coordinated concentration does more. Among the controlling variables, economic development, industrial structure, human capital, infrastructure, environmental regulation, foreign capital use and urbanization impact green developing efficiency in a variable way at different concentrating statuses. Under coordinated concentration, human capital and foreign capital use with threshold effects promote green developing efficiency more if over the threshold effects. This paper presents constructive suggestions for Yangtze river delta city cluster on green developing efficiency.

Green development is popular in protecting the Yangtze river, which is backed by synergy innovation. This paper selects panel data of 11 provinces along Yangtze river economic zone during 2009-2017, and uses compound synergy model and SBM to measure their synergy innovation ability and green development level of the 11 provinces. Results show that, as time goes by, their synergy innovative ability remains little change, but outstanding in geographic distribution, highest in the down-stream. The green development level is rising, not high generally with variance among provinces, relatively higher in Shanghai and Jiangsu in down-stream. Both strongly show a regional difference at the same pace. This paper applies panel Tobit model to study the impacts of government-customer-industry-institute synergy innovation ability on green development and concludes that this synergy innovation can improve green development, as clearly shown from middle- to down-stream, but not from up-stream.