From the perspective of linguistics,this paper uses Face Theory to observe and explain the chat-up behavior in interpersonal communication.According to the purpose and the situation,the chat-ups can be divided into"chat-up that wants to be close to people"(chat-up 1),"perfunctory in embarrassing situation"(chat-up 2)and"perfunctory that doesn't want to really communicate"(chat-up 3),and its characteristics and properties are observed respectively in combination with actual corpus.After preliminary exploration,we think that the main characteristics of the chat-up behavior are"negative situational"and"indirectness",the purpose of the chat-up behavior is to get close to people or perfunctory past situations,and the function of the chat-up behavior is fundamentally face maintenance.Chatting up is a kind of verbal communication with form greater than content.It makes human verbal communication more flexible and diverse,and can adapt to various complicated situations and achieve better communicative effects.