Human language is an instrument of communication. In studying language change, we must consider the role of social factors in language change. Social class, gender, typically, intrigue language change. Lately, lexical diffusionist also consider the social factors like dialect borrowing, interaction of literary form and speech form. A new trends appear in the name of Socio-historical linguistics, which study the history of language and language change in the relation of social context. In studying history of chinese langauge, we consider the role of social factors, then we will make progress in understanding history of chinese langauge