ⅠINTRODUCTION The development of human society is a process of differentiation and integration.The differentiation of the society always brings about the language differentiation;while the integration of the society requires the language integration at all time.As a famous linguist Chen Yuan goes:“Language is a variable,and society is another variable.These two variables are influencing each other;interacting each other;restricting IINTRODUCTION The development of human society is a process of differentiation and integration.The differentiation of the society always brings about the language differentiation; while the integration of the society requires the language integration at all time. As a famous linguist Chen Yuan goes: ”语言 is a variable, and society is another variable .sese two variables are influencing each other; interacting each other; restricting