The Nantong-Suzhou-Ningbo High-speed Railway is a north–south high-speed railway in the Yangtze River Delta, with a total length of about 309.8 kilometers, a design speed of 350 kilometers per hour, and 10 stations. The 29.2-kilometer-long Hangzhou Bay Cross-sea Railway Bridge is the key project of the whole line. It is a double-track railway and the design service life of its main structure is 100 years.

The construction of this super  cross-sea project faces many challenges. The Hangzhou Bay is one of the three strongest force tide bays in the world. The bridge construction is influenced by hydrological, meteorological and geological conditions and other natural factors; some of the bridge structures are applied for the first time in the cross-sea bridges, and the construction faces many technological difficulties; the bridge crosses the marine protected area of the Qiantang River Estuary, and ecological protection puts high requirements on the construction.

After the completion of the railway, it will optimize the layout of high-speed railway network in the Yangtze River Delta, enhance the connection among cities in coastal areas of Southeast China, and play a positive role in promoting the high-quality integrated development of the Yangtze River Delta.