This paper compared the relevant economic data of the east part, the middle part and the west part and analyses the interaction mechanism between the industry development level and urbanization level. On this basis, this paper points out that the important reason for appearance of economic concave valley in middle part lies in vicious circle between industry weak quality and backward urbanization, and the key to solve this problem rests with impelling industry's development and urbanization to realize benign interaction. As to this, this paper puts forward some tentative proposals.