In recent years, under the impact of marketization and social transformation, the diversification of social strata and the disappearance of the theory of class determinism provide a broad space for research on vertical stratum mobility and horizontal stratum interactions. Although interest adjustment and social differentiation occurring during the period of social transition have inevitably given rise to contradictions and distinctions between various social strata and some social problems, sustained economic development and social reform have also created enormous opportunities for social mobility, and the market has promoted the rational allocation of resources in the process of gradually occupying the dominant position. A benign, bottom-up stratum change is the manifestation of social development. As more in-depth studies have been conducted on social stratification and social mobility, scholars have begun to pay more attention to the mechanism of social stratum formation and the subjective perceptions of members of strata. Domestic studies on social stratification have begun to shift their focus from objective social stratification structures and stratum characteristics to subjective identification and social integration of social strata.