Abstract: Based on the inter-city reachability and the urban comprehensive quality, this paper constructs the urban comprehensive quality index system, and quantitatively analyzes the economic connection intensity of “three districts synergy” in Jiangxi Province. The results show that the degree of economic connection between the regions in Jiangxi Province is low, the economic connection of the transformation, upgrading and development area of western Jiangxi in the three regions is the strongest, the difference of the comprehensive strength of the cities in the three regions is great, and the overall economic strength of each city is weak. To promote the development of “three regions coordinated” in Jiangxi Province, it is necessary to make up the “breakpoint”, strengthen the construction of transportation system, open the “blocking point”, promote the coordinated development of inter-regional industry, break through the “difficulties” and create the mechanism of mutual recognition and sharing of public services.