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.