How does Chinese society define the class and stratum? Why do the classified methods and the standards of the class and stratum take place? The thesis primarily concentrates on studying the class and stratum in Chinese society. Reviewing class and stratification concepts, the reexamination of theories and the establishment of analytical framework, the thesis claims that the classified methods of the class and stratum are usually motivated by political purposes. That is to say, new class and the stratum categories derive from the alternations of political purposes. Hence, in addition to assisting readers to understand how Chinese class and stratum are classified, the result of the research can also predict the future development of class and stratum in Chinese society by means of the reformation of politics, economy, and the society.