Based on the world city 2.0 evaluation index system proposed by “Annual Report on World Cities”，this paper analyzes the upgrading capacity of 40 cities in 7 dimensions. The findings shows that all the scores of comprehensive upgrading ability，social upgrading ability，ecological upgrading ability，management upgrading ability and spatial upgrading ability have the convergence trend，and their gap between cities is relatively small. The score of the upgrading ability related to innovation has a large differentiation，shows that the polarization trends of innovation ability. The overall trends are the convergence of the comprehensive ability and the polarization of innovation ability，which indicates that the city government should attach importance to the improvement of economy and culture.