Abstract: This paper describes the static and dynamic test of the three reinforced concrete simply supported T-beam bridges by vehicular load test. The dynamic methods can be used to measure the bridge coefficient of lateral distribution and vertical deflection, etc. To show the static results. in the paper, the impact coefficient of the live load of the running vehicle is measured and analysed. At last, the stiffness relation is studied and load carrying capacity of old bridges is analysed. Examples are given for reference.