Research on the Hukou system and the optimization of China's city size distribution Research on the financial factor in the evolution of China's income distribution Research on tax system for regulation of resident income distribution Research on the spatial optimization of major cities in western China Research on the democratization of China's cadres selection Research on the structure optimization of grain industry Research on the system and the process of civil industry agile mobilization Research on the institution of land taking compensation fee distribution Research on the optimization of China's foreign trade structure Research on the governance structure optimization of physical education in Chinese universities