In the late kaiyuan period, due to the long-term stability and prosperity, Xuanzong gradually lost the spirit of making great efforts to govern. After another day's treasure, he indulged in pleasure, spoiled Yang Guifei, trusted eunuch Gao Lishi, and handed over all state affairs to Prime Minister Li. Li catered to Xuanzong in everything, but privately he used his power to act arbitrarily. After Fu died, Yang Guifei's cousin, Yang, succeeded as prime minister, and even rejected dissidents and accepted bribes, making politics increasingly corrupt. In addition, at that time, land annexation was fierce, the gap between the rich and the poor was serious, and politics, economy and society gradually declined.
Originally, because of its external development, Xuanzong stationed heavy troops on the border and set up ten major military towns, with our time as the highest military chief. Our special envoy leads many countries with great power. At first, he was appointed as a minister by the central government. After meritorious service, he often goes to worship. After Tianbao, in order to consolidate his power, Li blocked the way for the commander of the frontier fortress to enter the phase, and used the conference semifinals as an ambassador on the pretext that civil servants did not understand military affairs. As a result, the conference semifinals gave An Lushan an opportunity to oppose the Tang Dynasty.