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Cooperative Principle calls for people to speak in such a way that is informative, truthful, relevant, clear and brief.However, in diplomatic circle,sometimes politicians do not obey the Cooperative Principle, frequently conveying indirectly their meanings by using vague expressions for various political purposes.This essay analyzes the vagueness in diplomatic language from the perspective Cooperative Principle, investigating how the use of vagueness violates the Cooperative Principle and how diplomats manage to achieve various pragmatic purposes.