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Dynamic load test is an effective method to analyze the dynamic characteristics of bridges. Firstly, through TST5926 EV large scale structure dynamic characteristic test and analysis system, taking Yu-Quan Bridge of Jiangsu Normal University as the research object, the field test was carried out. Based on environmental incentives, the first two order natural frequencies, damping and vibration patterns of the bridge were determined by the basic frequency modal test. Secondly, through the running car test and brake test under different speed, the maximum and minimum dynamic deformation of the bridge was measured by using TST5925 EV wireless telemetry dynamic strain measurement and analysis system. Using the relationship between the dynamic amplification coefficient and the impact coefficient, the impact coefficient of the bridge was calculated. As the speed of the sports car increases, the impact coefficient presents an approximate sine curve. [ABSTRACT FROM AUTHOR]