The Niangziguan is a famous pass of the Great Wall of China, and it is known as the ninth gate of the Great Wall. It is a must-see place for soldiers from all generations. It is located at the west exit of Jingxing County, Shijiazhuang City, Hebei Province, on the west side of the Taihang Mountains, and the foothills of Mianshan Mountain in the northeast of Pingding County, Yangquan City, Shanxi Province. The original name of the girl Guan was "Hezeguan", because the Tang Dynasty Princess Pingyang once led the troops to station here, the troops of the princess Pingyang was called "the girl army", so it was named.