Language divides with social differentiation, and the degree of social differentiation directly determines the degree of language differentiation. Language differentiation is first manifested in regional dialects, that is, the emergence of various local varieties of the same language. Regional dialects are adapted to the semi-differentiated state of society. Secondly, language differentiation is manifested in the languages of relatives with the same historical origin. Third, the same language can also show various characteristics due to social community differentiation, which is social dialect.