Abstract:The main goal of building harmonious society is to control income disparities and adjust income distribution system.Based on data from income distribution of urban residents and EGR method of measuring income distribution,this paper analyzes the evolution of urban residents’ income distribution from the angle of income mobility.The result shows that the index of income bipolarization of urban residents in China from 1995 to 2008 has constantly become bigger and bigger.However,since the income proportion of low-income groups has decreased and that of middle and high-income groups has risen,the income distribution has not shown significant bipolarization trend in urban China.Yet the expanded bipolarization index still implies that the government should not only attach the importance to the income increase but also control the income disparities of residents.