This paper primarily calculates the similar coefficients of the industrial structure in Changchun and Jilin City, the results show that the similarity of the three industries in the two cities is high, but the similarity of the subdivided manufacture industries is low. We also find evidence that the conditions for the industrial integration of the two cities are improved. The paper also explores the reasons for the current situation of the industrial integration in Changchun and Jilin city, then propose the measures to develop the industrial integration.