Abstract:Jincheng is located in the southeast of Shanxi Province, the southern end of Taihang Mountain Dan River basin. Since qianlong of qing Dynasty to Guangxu years, jincheng city's defense buildings have been continuously repaired and built, and the defense facilities around the city have been well preserved. Although the ancient city has been destroyed, but there are still ruins, sand river waterway can be examined. The existing Jingde Bridge outside the west gate, Jingzhong Bridge outside the east gate and Jinnan Bridge outside the south Gate of Jincheng city were built to meet the needs of traffic inside and outside the city under specific historical and geographical conditions. This paper describes the field investigation and study of three Bridges, and analyzes their construction history, structural characteristics and technical achievements.