"Nanzheng County Zhi" records: "Hanzhong Fucheng North Gate outside Xu, there is Hutou Bridge, the flat land column of stones, there are no ditches under it, but no bridge, but it has been circulating for a long time, and the monument is erected. Inquiry of the residence. Yun: Wei Yan died in the three countries." Examination "Zhai Zhi", "Yan Ben Hanzhong, Yang Yi sent the horse to be cut off." Folk words and history are in line. The bridge is more than two from Ma Ping, and the ornaments around Yan Tomb are still left.