The interpretation of pun is a branch of applied linguistics,at the mean time; it is a rhetorical approach in our daily communication.Sometimes it is compared to an art and varies from one another.Meanwhile it brings the charming of language into full play,which can demonstrate the complicated meanings with the simple language.Pun is humorous and vivid; sometimes it looks like a puzzle and makes people feel confused with blurry color.My thesis mainly focuses on lexical pun,homograph homophony pun and imitation pun.In terms of literal translation and free translation by idea.I sincerely hope it can help people to better understand the pans translation to attain our expectations.