Mathematical Bridge is a bridge in the city of Cambridge, England, which crosses the River of Cambridge University campus, connecting Queen's College on both sides of the River of Cambridge, between Trinity College and Trinity College. Mathematical Bridge is its unofficial name, its official name is simply "wood bridge." The Mathematical Bridge was designed by William Etheridge II and built by James Essex in 1749. The Mathematical Bridge was rebuilt in 1866 and 1905, but the original design did not change. The bridge has now been replaced by a new bridge, with the arrangement of the wooden bars forming an arc, supporting the bridge, and other transverse components forming a triangular structure to hold the bridge. The structure here effectively uses wood without wasting, while borrowing the arch design common to stone bridges, consolidating its structure. However, there are several sources of mathematical bridge design: 1. The bridge is designed by China, and some special mathematical equations are used in the design, because the name of the mathematical bridge is obtained. 2, the bridge is designed by the general students, the design of the bridge (weight and angle number) is very precise, even a nail is not used, a professor saw the bridge after the breathtaking, and wanted to remove the bridge to understand the design of the bridge. However, after the professor removed the bridge, there was no way to use the original design to rebuild the bridge, so the professor used nails to rebuild the bridge. The bridge was designed and built by Newton, and as the second legend, his design did not use the last nail, the students saw the design of the bridge and removed the bridge, but there was no way to rebuild it. But this is not true because Newton died 22 years before the bridge was built.