The high-quality economic development is the necessary road for China to build a modern socialist country in a new era. The high-quality economic development indicators measured in line with the new development philosophy suggest that the high-quality economic development in urban areas advances despite fluctuations and features quality convergence. The high-quality economic development requires increased public investment in education，medical care and environmental protection to shore up weak links in social and environmental development. We need to promote the quality of development of the western and small and medium-sized cities through the high-quality development of eastern and the first-tier cities to achieve the regional balanced development on the quality front. There is an “inverted U” relationship between high-quality development and quantity of growth. The balance between quantity and quality can boost the coordinated development of high-quality development and quantity of growth.