写作，历来被认为是“经国之大业，不朽之盛事”。古今中外，不少有作为的政治家都十分注重自身的文字修养，并严格督促下属勤于写作。唐代公文有严格的“职述”和“代拟”规定。“职述”即担任某种职务的官员必须亲自拟写与其职务相称的公文，不得假手他人，如有违例，轻则贬? Writing has always been considered as “the great cause of the country, an event of immortality.” At all times and in all countries, quite a few politicians who have done well pay great attention to their own literary accomplishments and strictly supervise their subordinates in writing. Tang official documents have strict “job description” and “on behalf of” provisions. Officials who “serve as posts” in a certain position must personally write official documents commensurate with their duties, not fake others, and if not, ignore them.