Qin dynasty and Han dynasty always confronted with the Hun nationality occupying the Mongolian Plateau, and in the Warring States Period wars often occurred between them. In Qin dynasty, the Huiwen Emperor took twenty-five cities of Yiqu area and then Zhao Emperor took the rest from Hun nationality.“Qin dynasty owned Rongxi, Beidi and Shangjun and built the Great Wall to prevent Hun nationality from wresting”. Thus, there exists the Qin dynasty Great Wall in the Warring States Period in Guyuan city.
Like a dragon, the Great Wall starts from the valley of the Yao River in Linyao county of Gansu province, passing through Weiyuan, Rongxi, Tongwei, Jingning counties and going along with the eastern bank of the Hulu River, then entering Xiji county by Beixiakou and Runmiao villages, continuing to Huangjiacha village, Yuqiao, Zhangjiezi, Haoshuichuankou, Shanmin, Xingrong, Xiejiadongpo, Wangjiawan, Hanjiabao and turning towards the east at a tuning angle of 90 degree at Jiangtai to the valley of the Malian River and Malian Shuimiao, and to Zhangyi country in Guyuan county and turning again towards the northeast at Huangbaodong to Hongzhuang country. Then it goes into Didi valley and to Sunjianzhuang and Baijiawan at which it shifts to the east to Wuzhuang, Runjiazhuang and Mingzhuang. It is divided to two walls in the northwest of Mingzhuan, namely, the Inner Wall and the Outer Wall.
The Inner Wall firstly crosses the road and climbs on the hill 5 kilometers away from Guyuan city at the northwest, passes Guzhuang, Shilipu, the Qingshui River and arrives at Shawo. The Outer Wall which forms the shape of an irregular roachback, goes through Qiaowa and the Qingshui River and turns to the southeast to meet with the Inner Wall at Shawo. The two walls are in sharp contrast. The Outer Wall is tall, thick and integral with straight lines, full of power and grandeur. However, it is broken and razed to the ground at a large extent, and its forts are mainly of the height of two to three meters. Except some breaches due to the modern roads and later gulley, the Inner Wall with a length of 8 kilometers is well preserved without any discontinuity and has forts at intervals of 200 to 230 meters.