This article did the empirical analysis on the paradoxical situation,characteristics, behavior orientation of various social strata in Beijing.The analysis found that social contradictions will increase in intensity with the decline of social class position,and the composition of the different sectors of social contradictions is also different between the different sectors of the social contradictions,of which the upper middle class interests is damaged most seriously,but the economic situation effectively alleviate social contradictions of the upper middle class and upper class.The upper class is more inclined to maintain the rights within the system. <<