“函”是国家行政机关公文的主要种类之一。其使用范围较广,使用频率较高。且自1981年2月27日国务院办公厅发布《国家行政机关公文处理暂行办法》至今20年间,“函”的适用内容及范围几经变动,而相应的规范要求在公文的使用与研究中却没能十分充分地体现出来,以致对“函”的随意理解不仅反映在一些行政机关的公文具体运 “Letter ” is one of the main types of official documents of the state administration. Its use of a wider range, the use of higher frequency. And since February 27, 1981, the State Council General Office promulgated the “Provisional Measures for the Administration of State Official Documents,” so far 20 years, “letter ” of the applicable content and scope of several changes, and the corresponding norms in the use of documents and research But failed to fully reflect it, so that the arbitrary understanding of “letters” is not only reflected in the official documents of some administrative organs