函是一种平行文,其基本功能是用于不相隶属机关之间商洽工作、询问和答复问题,向主管部门请求批准和主管部门答复审批事项,与其它行政公文一样,具有由制发机关权限决定的法定效力。在实际工作中,函的使用范围很广,涉及多方面的公务联系,正因为如此,目前十三种行政公文中,函的用法比较混乱,存在的问题也较多,归纳起来,主要有以下几个方面: The letter is a kind of parallel language. Its basic function is to negotiate with non-affiliated agencies, ask and answer questions, request for approval from the competent department, and approve the examination and approval items by the competent departments. Like other administrative documents, The legal effect of the authority decision. In practical work, the letter is widely used in a wide range of fields and involves many aspects of official contact. For this reason, in the current 13 administrative documents, the usage of letters is rather chaotic and there are still many problems. In summary, several aspects: