What Is the World Biggest Bridge in China
The world biggest bridge in China by length is the Danyang–Kunshan Grand Bridge, part of the Beijing–Shanghai High-Speed Railway. It spans about 164.8 kilometers (102.4 miles), making it the longest bridge ever built, according to Guinness World Records and engineering reports from major infrastructure sources Forbes.
The bridge carries high-speed rail traffic between Shanghai and Beijing and was completed ahead of the 2010 opening of the line. It crosses flat delta terrain in Jiangsu Province, including rivers, lakes, and low-lying farmland, and is designed for speeds up to 350 kilometers per hour on the Beijing–Shanghai corridor Railway Technology.
Engineering and Construction Details
The Danyang–Kunshan Grand Bridge was built between 2006 and 2010 by a joint venture led by China Railway Group and major Chinese engineering firms, with total project costs estimated at about $8.5 billion. The structure uses prestressed concrete box girders, viaduct segments, and thousands of piers to maintain stability across soft alluvial soil and waterlogged sections Structurae.
Design Features and Records
Engineers designed the bridge with expansion joints, seismic dampers, and deep pile foundations to handle heavy train loads, temperature changes, and regional flood conditions. Its record length surpasses previous long-span rail and road bridges, reinforcing China's leadership in large-scale infrastructure execution and high-speed rail network expansion.
Comparison With Other Long Bridges
By total length, the Danyang–Kunshan Grand Bridge exceeds China's Tianjin Grand Bridge and the United States' Lake Pontchartrain Causeway, both of which previously held length records for different bridge categories. Its continuous viaduct format, high-speed rail function, and crossing of multiple waterways distinguish it from shorter causeways and segmented expressway bridges Bridge Work Construction.
Why Length Matters for High-Speed Rail
Long, straight viaducts reduce curves, grades, and land acquisition conflicts along dense corridors, allowing trains to maintain constant high speeds. The bridge also limits interference with local roads, farms, and flood channels, a key reason Chinese planners favor massive bridge structures for new high-speed lines.