This article uses CHNS survey data in eight years，chooses corresponding polarization measurement methods according to different groups，and uses the related income distribution diagram to analyze income bipolarization situation of Chinese residents，and the results show that income bipolarization degree of Chinese residents and urban-rural income bipolarization degree based on median and average grouping are constantly rising during 1988—2003 and began to decline after 2003，however，the modal grouping can not properly measure the income bipolarization situation of Chinese residents，but the income bipolarization indicators based on the poverty-line grouping continuously show rising trend. Thus，under the background of effective control of income bipolarization trend of Chinese residents，the income and living situation of poor Chinese should be emphasized，and Chinese Government should further perfect income distribution system to improve income and living situation of the poor Chinese.