“函”是一种使用广泛、灵活方便的公文文种。在疾病预防控制工作中,如同其他公文文种一样,“函”被广泛而频繁使用。但就目前“函”在疾病预防控制工作中使用现状来看,存在的问题较多,现状令人堪忧。首先是许多人并不了解“函”的确切定义及格式要求;其次是使用的随意性太大, “Letter” is a widely used, flexible and convenient official document. In the prevention and control of diseases, as in other official languages, “letters” are widely and frequently used. However, at present, the current situation of “letter” in the use of disease prevention and control shows that there are many problems and the current situation is worrisome. First of all, many people do not understand the exact definition and format requirements of “letters”; secondly, the randomness of use is too large,