Ouyang Xuan, who majored in chemical engineering, had difficulty getting a job, so he had to take an examination of a county career editor and became a librarian. Unexpectedly, he traveled to Chongqing, the Shu region at the end of the Southern Song Dynasty. At this time, the land of Bashu was ruined by the Mongol invasion. He was ordered to escape into the deep mountains with a group of Xiang army soldiers. / He used his historical knowledge and modern technology to develop industry and technology, and reformed the political system, and drove the Mongols out of Sichuan with hot weapons. After the fall of the Southern Song Dynasty, He sent his army northward to recover the Central Plains, and drove the Mongols to West Asia and the west of the Ural Mountains. At the same time, he opened up the territory, established colonies in America, Australia and Africa, and realized the republic of all ethnic groups.