三省指中书省、门下省、尚书省。隋设五省:尚书省、门下省、内史省、秘书省、内侍省。唐初设六省:尚书省、门下省、中书省、秘书省、殿中省、内侍省。其中以尚书、门下、中书三省最为重要。隋文帝时,决定内史省(即中书省)取 Three provinces refer to Shuzhong, under the province, Shangshu province. Sui set five provinces: Shangshu province, under the province, the province of history, the provincial secretary, the paternity province. Early Tang set six provinces: Shangshu Province, under the province, Shuzhongshu, secretary of the province, the provincial hall, the paternity province. Among them, Shangshu, Menxia, ​​Zhongshu three provinces is the most important. Sui Wendi, the decision of the province of history (that is, the Central Plains province) to take