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...