In A.D. 1480 (16th year of Chenghua), Batumonko was in the reign of Khan. It is called Dayan Khan (a different translation of Dayuan Khan). A reunified Mongolia. His enfeoffment system had a far-reaching influence on later generations, thus forming two parts, Monan and Mobei, which became the basis for the establishment of the League Flag in Mongolia in the Qing Dynasty. 15 17 (the 12th year of Zhengde in Ming Dynasty) After the death of Dayan Khan, the feudal regime gradually appeared in Mongolia. Mongolian feudal lords formed three groups: Monan Mongolia, Mobei Halka Mongolia and Moxiweilat Mongolia. In the late Ming Dynasty, Monan Mongolia started from Jilin in the east, Helan Mountain in the west, the Great Wall in the south and the Han Sea in the north. There are Horqin in Nenjiang River basin and Bahrain, Zalut, Naiman, Onniute Banner, Harqin and Tumote in Xilamulun River basin in the east, Tumote in Guihua City and Ordos in Hetao area in the west. Chahar is in the middle, and he is the nominal patriarch of the various ministries in Monan Mongolia.
In A.D. 1636 (the ninth year of Chongzhen in the Ming Dynasty and the first year of Chongde in the Qing Dynasty), forty-nine feudal lords of the sixteen divisions of Monan Mongolia gathered in Shengjing (present-day Shenyang), identified Huang Taiji as the heir of Mongolian Khan, and gave him the title of Bokeda Chechen Khan (Emperor Kuan Wen Ren). In the same year, the title of Huang taiji was clearer, that is, the emperor's position was changed to Chongde. From then on, the ministers of Monan Mongolia belonged to the Qing Dynasty and made great efforts in the process of unifying the whole country. In the same year, the Qing Dynasty classified most of the southern part of the Ming Dynasty into the "Neizasak Mongolia" six leagues and forty-nine flags among the "outer vassal Mongolia". They have military power, and they are directly under Yuan. These six leagues are Zhelimu League (including Zhelimu League, Xing 'an League and parts of Heilongjiang, Jilin and Liaoning), Zhaowuda League (now most of Chifeng City), Zhuosotu League (now southern Chifeng City and parts of Liaoning Province), Xilin Gol League (now northern Xilin Gol League), Wulanchabu League (now northern Wulanchabu and Bayannaoer League) and Yikezhao League. In A.D. 1664 (the third year of Emperor Kangxi of Qing Dynasty), the Qing Dynasty divided Inner Zasak Mongolia and Outer Zasak Mongolia into Inner Mongolia and Outer Mongolia with thousands of miles of desert (now the border area between China and Mongolia) as the boundary. Since then, the area where Zazak Mongolian League and Banner are distributed is called Inner Mongolia. The regional title of "Inner Mongolia" has been used to this day.
During the Qing Dynasty, in Inner Mongolia (Monan), in addition to the forty-nine banners of Inner Mongolia's six leagues, there were also the Eight Banners of Chahar, the Two Wings Banner of Tumote in Guihua City, the flags of Hulunbeier and Xiboha (now the eastern part of Hulunbeier League), and the Alashan and Ejina banners listed as Inner Mongolia.