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It is a fact that in U.S.the immigration between rural areas and city areas is free,but in China this type of immigration is restricted by HUKOU system(Hukou,namely the household registration system,was designed to control rural-urban in China).All of those national policies in city areas are much better than those in rural areas,so those corresponding differences bring about great discrepancy of the economic status(mainly including GDP per person and income per resident)between rural and city areas in the same urban region,especially in different urban regions because the percentage of urban residents in those urban regions is in-equable.The present paper mainly researches the topic of relationship between the percentage of urban residents and the economic status in an urban region in China,including the relationship between the economic and the political functions of a settlement in China during the process of urbanization.