杜佑《通典·职官典》是一部系统的官制通史,上起唐虞时代,下迄于唐肃宗时期,且尤详于唐制。《职官典》二十二卷是了解唐肃宗以前官制必读之书。《四库全书总目提要》称《通典》:“每事以类相从,凡历代沿革,悉为记载,详而不烦,简而有要,元 Du You ”Tongdian Officials Code“ is a systematic history of the official system, starting from the era of Tang Yu, as late Tang Suzong period, and in particular, the Tang system. ”Officials Code“ twenty-two volumes is to understand Tang Suzong before the official must-read book. ”Sikuquanshu chief executive summary,“ said ”Tongdian“: ”everything from the class phase, where the history of evolution, as recorded, detailed but not annoying, simple and important, yuan