Abstract: In the paper, the author first explains the relationship between development of the world city and economy growth, the innovation of science and technology, regional foundation and then summarizes the general law of the world city structure evolution and growth process. Based on the comprehensive analysis of interior and external environment, the authors put forward the basic economy mode and spatial structure mode of Beijing's constructing the world city. The basic economy modes are as follows: enlarge opening; carry forward the industry value chain division; improve the proportion of advanced producer service industry and high technology industry in economy structure; attract actively the transnational corporation headquarters and R&D institutions; intensify the ability to configure the global economy resources. To form the reasonable spatial division in the Metropolitan Area and the Area Around Bohai and change the single core region structure into multi-core region structure are the basic spatial structure modes. Finally, the authors further put forward six policy tendencies of Beijing's constructing the world city.