There are two theoretical traditions about social mobility and social stratification: one is the class theoretical tradition based on Marx, and the other is the western social stratification theoretical tradition based on Weber. Same: Marx's and Weber's social stratification theories both belong to the classical social stratification theory, and both think that social stratification is related to economy, which has a great influence on the future research of social stratification and social mobility. Different: 1, different standards of class division. Marx believes that class is related to the relations of production in ownership. Weber believes that class division is related to individuals' market position and life opportunities. 2. The goal of class theory is different. The goal of Marx's social stratification theory is to reveal the class inequality in capitalist society, emphasize the irreconcilability of class contradictions in capitalist society, and put forward that socialism will eventually replace capitalism. The goal of Weber's social stratification theory is to maintain capitalist rule, hoping to promote the benign operation and coordinated development of capitalist society through the study of social stratification. Weber's social stratification is a trinity theory of economy (wealth), politics (power) and society (prestige).