唐代百官的任命授职，依官职品阶的不同，授职的形式和机构也不同，颁发的任命书亦有所区别。 唐代授官的形式有四种：册授、制授、敕授和旨授。其任命书也因此而分为册书、制书、敕书和告身四种。 三品以上官员的任命是册授，是由皇帝当面册封。册授又分为两类：诸王及职事官 Appointment and appointment of officials in the Tang Dynasty, depending on the official grade, the form and organization of the appointment is also different, the appointment of the appointment is also different. There are four types of professors in the Tang Dynasty: books, professors, professors and professors. As a result, the books of appointment are divided into four types: books, books, books and reports. The appointment of more than three officials is a book grant, by the emperor face booklet. Book grant is divided into two categories: kings and clerks