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Achievements of the 20th century bridges to the development of the 21st century bridges The Main Point First: Abstract Second: 20th century bridge engineering major achievements Third:the development trend of the 21st century bridge First: Abstract Bridge engineering in the 20th century has made remarkable achievements. Due to the advances in design theory and a variety of new materials, new processes happened. In particular, the emergence of computer and application so that the form and structure of the bridge span has been leaps and bounds. It was found in bridge engineering, law and gained valuable experience for the 21st century laid the foundation for the bridge. This paper is summarized in bridge engineering in the 20th century, the achievements, right to the large-span bridges, flexible structure, development issues and the adoption of composite structures, new materials, new technology and other issues were discussed, and follow its own rules and may predict the development of the trend. Second: 20th century bridge engineering major achievements Span of the constant breakthroughs and innovations. The development of steel concrete bridge is worthy concerning. The vigorous development of small and medium-span bridges The bridge achievement around us Su-tong changjiang river large bridge Su-tong changjiang river large bridge 1.Four hightest in the world: 1.1The maximum main span. 1.2The deepest base. 1.3The highest bridge tower. 1.4The longest cable stayed 2.Ten key technology projects : 2.1 Research on the main bridge structure system . 2.2 Study on resistance wind Performance 2.3 Study on resistance seismic performance 2.4 Study on Anti-Ship Collision System 2.5 Large group pile foundation design and construction 2.6 Design and construction of scour protection 2.7 Ultra-high tower of steel-concrete bridge design and construction 2.8 Ultra-long cable-stayed damping technology 2.9 D