The Yangtze River Delta region both in total economic output, economic function, or as a strategic fulcrum position, for the economy of our country plays the role of mainstay. In the Yangtze River Delta region, the collaborative development will not only promote the integration of provinces and cities within the region economic and social development, will also on regional provinces and municipalities have important radiation leading role, and ultimately to promote the formation of a unified national market, thus become "45" during China's economic maintain an important guarantee for the stable and high quality growth continued. This paper proposed to use the concept of coordinated development to think about the Yangtze River Delta regional development objectives, content and ideas, and a detailed analysis of the "45" Yangtze River Delta during the regional coordinated development objectives, content and way of thinking design joint development framework of the general idea of the Yangtze River Delta, and proposed to speed up the Yangtze River Delta regional coordinated development of policy recommendations for. <<