Dajingmen, City gate in Qiaoxi District, Zhangjiakou, China.

Dajingmen is a city gate in Zhangjiakou standing 12 meters high and 9 meters wide, topped with a platform structure. The gate displays classic Chinese architecture with solid stone walls and traditional design elements.

The gate was built in 1644 during the Qing Dynasty and served as a key defensive position between China and Mongolia. Over time it remained strategically important for regional trade and movement.

The inscription above the gate, 大好河山 ("Magnificent Rivers and Mountains"), was mounted in 1927 on the initiative of Gao Weiyue, ruler of the former province of Chahar, and is written in Yan-style calligraphy. The gate's name means "border gate", and from 1571 the area outside it hosted the tribute market where Mongolian and European goods were exchanged for silk, tea and porcelain.

Dajingmen sits in the northern part of Zhangjiakou's main urban area, with Xitaiping Mountain to the west and the Qingshui River to the east. The gate can be reached on foot from the city centre. Just west of the gate, a roughly 100-metre brick-faced stretch of wall leads to a stone-built section that climbs the mountain terrain.

The gate connects to a roughly 100-meter brick section of the Great Wall that leads to a stone-built segment. This transition reveals different construction techniques from separate periods.