The book is concerned with research on income distribution inequality of Chinese residents in the last 20 years of the 20th century and the beginning of the 21th century. Measuring and making clear the status of inequality of every consisting parts of normal income of Chinese residents is an important concept. First, on the basis of the statistical data and the estimated data, as well as several kinds of methods that are used to calculate income inequality and suited for the available data, the authors computed the population-income Gini Coefficients of normal income inequality respectively for China's national, urban and rural areas. Second, by using urban/rural income ratio, Theil index and others, they measured the status and trends of Chinese urban/rural gap and regional income disparity, as well as their influence on the whole income inequality. Third, by case study and decomposition analysis some main factors, which had impacts on income inequality of urban and rural residents in China, and their influence, were researched. Fourth, the authors studied and measured the status and changes of the poor population and poverty rates in rural and urban areas in China. Fifth, the trend of inequality of normal income of Chinese residents was predicted at large, and the status of distribution inequality of Chinese residents was judged.