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In China,rapid urbanization has caused an increasing demand for urban land and the conflict between limited land resources and urban development.High urban density has been proposed as a method to solve this problem and realize sustainable urban development.To achieve this goal,the dynamics of urban density in China must be examined.The Defense Meteorological Satellite Program/Operational Linescan System(DMSP/OLS)nighttime light(NTL)data have been proved to be a good indicator of human activity,so we applied the data to measure urban density in 70 major cities in China during 1992 to 2010.