Yongji County (now the northeast of Guantao County, Cheng Xiao), whose capital was established late, was originally just a bridge on Yongji Canal, and gradually formed a market settlement due to the stopping and trading of merchants, which was called "Zhang Qiao Store" and "Zhang Qiao Market". In the seventh year of Dali (772), my ambassador Tian played in Zhang Qiao. Yongji Canal is located in the west of the county, with a width of 170 feet and a depth of 2 feet and 4 feet. Hence the name.