In the eleventh year of the Imperial title Kaiyuan (723 AD), the executive system of the Tang Dynasty converted from the threeprovince to the SecretariatChancellery system. After the An Lushan Rebellion, the SecretariatChancellery system gained gradual growth. The Supervisor Council as a supervisory branch increasingly lent its hand in national executive affairs, now participating in central decisions, now taking the responsibility of secretarial transfer in the operation of political affairs. As a result, it acted both as an executive inspection and as executive supervision organ. Even worse, the Council went so far as to take the power of delivering executive edicts and dealing with executive affairs, which should have been carried out by the officials of the six department of the Shangshu Province. The officialization of governmental affairs of the Supervisor Council caused it to take an important place in the operation of national political affairs, which meant an impact on the power of the Shangshu Province as the highest executive branch of the state.

bureaucratic establishment of the Tang Dynasty; the Supervisor Council; officialization of governmental affairs; the Secretariat-Chancellery system