Introduction to Baiyu Village: Baiyu Village is a typical military village. There is a "Tianjin Pass" (also known as Tianjing Pass) one kilometer north of the village. Successive dynasties have built passes and stationed troops here. , used to be passable, but now they are all imprisoned with stone walls. They all commanded the history department and dispatched troops to guard the courtyard. In the second year of Jingtai in the Ming Dynasty (1451), a main city, a fortress, and a gatekeeper's palace were built at the north gate. Until the end of the Qing Dynasty, there were still "extra" buildings. According to the records of "Wanshu Notes", Baiyu Village was located here because no plants could grow within ten miles of the Great Wall. Therefore, troops were sent to burn the mountain for many years, and a ditch of cypress and elm trees grew there. This disappeared, leaving only the name of Baiyu (Baiyu) village recorded in the book.