The official name of Diange college students. In the early Ming Dynasty, Ming Taizu Daxing unjustly imprisoned and killed the hero. In the thirteenth year of Hongwu (1380), Hu was killed, and the prime minister system of more than two thousand years was abolished, and the emperor was in charge of six ministries. In June of the 28th year of Hongwu (A.D. 1395), Taizu Yufeng Tiangong said to the civil and military officials: "Since ancient times, there have been three discussions on Taoism, and six ministers have their own duties. Since the Qin dynasty, he has been the prime minister, but he has not made a death. Because of this, there were wise men in Han, Tang and Song Dynasties, but most of them monopolized politics with villains. I set up five offices, six departments, Duchayuan, General Political Department, Dali Temple and other offices to manage world affairs, and I dare not press each other, so everything is safe in the court. In the future, heirs are not allowed to set up prime ministers. If the courtiers dare to invite the establishment, the civil and military officials will immediately violate the law and impose heavy sentences. " However, due to the huge workload, in the fifteenth year of Hongwu (1382), a university student had to be set up as an adviser to the emperor. At first, college students had no real power, similar to today's secretarial position. After the middle of the Ming Dynasty, it was actually the cabinet chief who gradually took part in confidential affairs. Draft imperial edicts, reply to the throne on behalf of the emperor, and actually master the power of the prime minister.