Research on evolution, evaluation and optimization of world cities' tourism economy structure Research on evolution, evaluation and optimazation of world cities' tourism economy structure Research on the construction mode and optimization of ITS in urban road network structure Research on economic effect evaluation and optimization of China's conunodity turnover tax refonn Research on performance evavuation and optimization of green supply chain management Research on the coordination and optimization of energy consumption structure and industrial structure Research on finite element analysis and optimization design of automobile structure Research on the optimization of China's foreign trade structure 并列题名：Research on economic effect evaluation and optimization of China's conunodity turnover tax refonn