In Yunnan Province, Baoshan City and Yongping County junction on the Lancang River, there is a fly in the cliff above the wall of the iron rope bridge, 1986 years ago Jihong Bridge is the oldest iron rope bridge in China. The location of Jihong Bridge is the ancient ferry of Lanjin in the Western Han Dynasty, and the song of "crossing Bonan, crossing Lanjin" was circulated in the Eastern Han Dynasty. Two centuries before the emergence of the Silk Road, from Xichang, Sichuan, through Yaoan, Shimonoseki, Baoshan, Yunnan, into Myanmar, India and other countries of the "Southwest Silk Road" has been formed, Jihong Bridge is the ancient post road on the throat. This place is the ancient raft crossing; East Han Dynasty Yongping early erected vine contempt bridge; Yuanzhen year (1295) to set up a wooden bridge, named Jihong Bridge; Ming Dynasty Chenghua eleven years (1475) to rebuild the iron bridge, the Qing Kangxi years to repair.