The Qidan nationality was originally a descendant of the Donghu nationality, and gradually evolved from the Yuwen Department of Xianbei. In the early years of the Tang Dynasty, the Khitan belonged to the Turks. At this time, he saw the great power demeanor of the Tang Dynasty, opened his eyes and turned to the arms of the Tang Dynasty. In 648, the Tang Dynasty set up the governor in the pastoral area of Qidan at the end of the Song Dynasty, with Kuge, the leader of Qidan, as the governor, giving Ali and Qidan a formal administrative division in the Tang Dynasty. After several twists and turns, the Khitan nationality was also in chaos. After Khan became the leader of the Khitan nationality in the afternoon, he accepted the knighthood of the Tang Dynasty and reorganized the Khitan society, which made the political and economic development of Khitan develop by leaps and bounds. Yakhan, the successor of Zuwu Khan, established a system, set up a government official, carved wood as a deed, and held a hole as a prison, which laid the foundation for the establishment of a nation-state.

In 9 16 AD, Baoji officially abolished the title of Khan, changed to the Han system, called "Heaven Emperor", established the Great Khitan State and built the West Tower as its capital.