Jiangyin Bridge spans more than1.300m.. It's a flexible bridge, but it vibrates easily in strong wind. 1940, three months after its completion, the Tacoma Bridge in the United States resonated in a gale of magnitude 8 (19 meters per second) and was twisted into a pile of ruins like a twist. Therefore, technically, we adopt a box beam with good stability, and make the section of the box beam into a "tuyere shape" with a thick middle and thin two ends. This box beam is similar to a streamlined box beam to reduce air resistance, and at the same time, guide plates are arranged on both sides of the box beam. The highest surface wind speed recorded in Jiangyin is 18m per second, which is equivalent to 28m on the bridge deck in the air. In Tongji Wind Tunnel Laboratory, a model of Jiangyin Bridge was built according to the ratio of1135 to simulate the local terrain conditions. In the wind tunnel laboratory, the limit wind speed of Jiangyin Bridge reaches 49m per second (equivalent to 15). Zhou Shizhong said that the seismic load of long-span bridges is also an important consideration. Not only the horizontal and vertical vibration, but also the vibration of two towers in different directions should be considered. The bridge site of Jiangyin Xishan Bridge is far from the geological fault zone, and the probability of an earthquake of magnitude 7 or above is very small. Through a lot of calculation and analysis, Jiangyin Bridge is still fortified at level 7.