Flattery has not been often regarded as the object of academic research since it has a negative perception that it is an expression for the opposite benefit or polishing apples to please someone. In this study, the positive effects and social functions of a flattery expression were investigated. Through the comparative analysis of Fengcheng(Flattery) Gongwei(Compliment), it was found that Fengcheng actually has praise and flattery meaning at the same time. In this study, this is defined as the flattery expression of politeness strategy. Because Fengcheng is to speak based on respect, solicitude, and politeness to the other person, it is not the speaker-oriented, but the listener-oriented language. Furthermore, it was also found that Fengcheng not only plays a role in enhancing intimacy with other people and facilitating human relationships in a dialogue, but also is an act of conversation that can get a favorable response from the other party in the process of social life. In this study, vocabulary, sentence, and discourse were analyzed respectively in order to derive expression method, usage environment and characteristics of Fengcheng.