唐代后期至两宋,中央政府起草文书诏命有两套秘书班子,一是翰林学士,称为内制;一是中书舍人,称为外制,合称两制。两制在多数情况下,只有加知制诰衔,才得行视草之职,否则仅备顾问,或任其他差遣。因此,加知制诰是唐宋时中央秘书官制度的重要特征,在一定意义上说,也是解开两制之谜的钥匙。知制诰初称知诏诰,派生于中书舍人。南朝时即有知诏诰。梁武帝时,“裴子野以中书侍郎鸿胪卿兼中书通事舍人,别敕知诏诰”(《通典·职官·中书舍人》)。《旧唐书·职官二》云:“魏、晋、齐、梁诏诰皆出于中书令、中书侍郎,中书通事舍人但掌呈奏而 From the late Tang Dynasty to the Song dynasties, the Central Government drafts the edict and has two sets of secretarial groups. One is the Hanlin bachelor, which is called the internal system; In most cases, the two systems only have to take the position of ”grassroots“ if they only gain the title of ”knowledge transfer,“ or they will only be consulted or sent for other dispatch. Therefore, the increase of knowledge system is an important feature of the system of the Central Party Secretary in the Tang and Song Dynasties. In a certain sense, it is also the key to solving the mystery of the two systems. The beginning of the knowledge system 知 know Chao Zhao, was derived from the book in person. When the Southern Dynasties know Chao Zhao. In the case of Liang Wudi, when Pei Ziye was a secretary of the Central Academy of Sciences, he wrote a book entitled ”Rev. “Old Tang official two” cloud: "Wei, Jin, Qi, Liangzhao 诰 are out of books, books, assistant minister, but in the book,