The ancient city of Machi is the oldest and largest ancient city in Baotou. The ancient city is located in Machi Township, Jiuyuan District, Baotou City. The structure of the ancient city outside the city was rich in green hemp in the three lakes of Baotou in the early Qing Dynasty. At that time, there were 13 nettle ponds here, and the village garden was called Machi Village. The ancient city is 6 meters, the bottom is 10 meters wide, and the top is3-4 meters wide. It is divided into two cities in the north and south, in a double diamond shape, or: the two cities are in a diagonal "Lu" shape, connecting each other. The direction is 8 degrees. The north and south of the north of the north are 690 meters long, and the east and west are 720 meters wide. The south and south of the south are 600 meters long and the west and west are 640 meters wide. The middle section of the north wall of the north wall and the west section of the south wall are each set 15 meters wide. The surface of the ancient city in the city is scattered with board tiles, tube tiles, tiles and other building materials and pots, pots, bowls, beans and other pottery fragments, often with "five baht" money, iron fields, shovels and copper foils. In the 1950s, bricks with the words "Wanshi" were found. Baotou area of the Warring States, Qin, Han Great Wall, more square, distribution is very regular, the location is generally Yinshan north and south traffic road, Machi ancient city just faces the south exit of Kundulungou, obviously in the military important position. Experts determined that the north city of Machi ancient city is earlier than the south city, and the Qin direct road starting point shape, layout of the same three earthen platform base is also in the north city, the north city should be the end of the Qin direct road - Jiuyuan City. It is also the Warring States, Qin, Han Jiuyuan, Han Wuyuan County. The south city of Machi Ancient City is the county town of Wuyuan County, Han Wuyuan County.