Tianjin's retractable bridge represents the development of retractable bridges in China and even the world. Its opening and closing modes are: rotary, split, telescopic and lifting. For example, Jintang Bridge is rotating; Wanguo Bridge is a separated bridge. The design of the bridge reached the world level at that time, and the shape was beautiful. It is a landmark bridge building in Tianjin. After 80 years of spring and autumn, the Wanguo Bridge has been well preserved.