Three Provinces and Six Departments System: It is a set of tightly organized central official system in China's ancient feudal society. It was established in the Sui Dynasty, and the six-part system remained basically unchanged from then until the end of the Qing Dynasty. For the three-province system, the Eastern Han Dynasty formed Shangshu Province (called Shangshutai); In the Three Kingdoms period, Zhongshu Province and Menxia Province were established in order to divide and restrict the power of Shangshu Province. In the process of development, the organizational form and power evolved, and it was only in the Sui Dynasty that it was unified into three provinces and six ministries, which were mainly responsible for the formulation, deliberation and implementation of central government decrees and policies. Rulers in different periods have made some adjustments and supplements that are conducive to strengthening centralization.