Contexts and interlocutors are premises both for communication and for a successful turn-taking when using vague expressions. They are also keys to the successful strategies.Based on categorization of vague language by Channell,pragmatic functions of vague language were analyzed to present how to correctly use vague language in interpersonal communication. Contexts and interlocutors are premises both for communication and for a successful turn-taking when using vague expressions. They are also keys to the successful strategies. Based on categorization of vague language by Channell, pragmatic functions of vague language were analyzed to present how how to correctly use vague language in interpersonal communication.