From the 14th century to the 15th century, with the continuous restoration and improvement of the Great Wall, Gubeikou became an important logistics channel from Beijing to the north and northeast, and the dart bureau came into being. Zhenyuan Bodyguard Bureau is named after Zhang Zhenyuan, the chief bodyguard. It is located in the scenic area of Gubeishui Town. There are six courtyards around it. It has a large scale. There are cultural exhibitions of Bodyguard Bureau and places where bodyguards live and practice martial arts. It is very eye-opening.