The official name of the prime minister in Song Dynasty is Pingzhang, and the official name is participation in politics. From the Han Dynasty to the Tang Dynasty, the emperor's courtesy to the prime minister gradually degenerated, and Song Taizu abolished the "sitting theory" ceremony, which greatly reduced the position of the prime minister. Zongshen Yuanfeng was reorganized with two prime ministers. The prime minister said that Shang Shu was a left servant and assistant minister, and the other was a right servant and assistant minister. In addition, there are assistant ministers under the door, assistant ministers in the book, and ministers around. Huizong was in charge of the government at the same time, and changed his left servant to be Taizai and assistant minister, and his right servant to be Shaozai and assistant minister of Chinese books. During the reign of Emperor Gaozong, the official name of the prime minister was changed to the official name of Shangshu, and the official name of the prime minister was the same as that of Zhongshu. The main road between filial piety was changed to the prime minister.