This report systematically evaluates the level of green development of 126 cities in the Yangtze River Economic Belt in 2019 from three areas：green ecology，green manufacturing and green lifestyle. On this basis，the cities’ comprehensive green development index and level of development in these three areas are measured and ranked，in order to formulate comprehensive measurements about the level of development and regional characterization in the Yangtze River Economic Belt. Finally，the development of the top 20 leading cities in the comprehensive index was highlighted.