公示语作为社会用语的组成部分,有其鲜明的文体特点。然而随着社会的发展公示语也经历了不同程度的变化,除了指示,提示,限制,禁止四种功能分类外,新的功能宣传功能越来越突出。语言形式的变化即修辞在公示语中的运用充分体现了言语行为理论和礼貌原则。 As an integral part of social terms, public signs have their distinctive stylistic features. However, with the development of society, the publicity signs have also undergone various changes. Apart from the four categories of instructions, prompts, restrictions and prohibitions, the new functions of publicity become more and more prominent. The change of language form, that is, the use of rhetoric in public signs, fully embodies the speech act theory and politeness principle.