Deformation sensors were installed on truck axles and calibrated to get the relationships between the sensor readings and tire contact pressure. The truck dynamic loading was measured, and the effects of pavement evenness, vehicle speed and truck weight on the dynamic loading were analyzed. The results show that the average dynamic load coefficients (DLC) are 5%, 15%和20% for good, median, and poor ride quality index (RQI), respectively, and the maximum DLC is more than 90%. The maximum dynamic loads (MDL) are 20%, 55% and 80% more than the static load, and the changing rate of MDL can be more than 90%. DLC, MDL and its changing rate increase with speed, especially when the RQI is poor. The results presented provide the basic data for considering the dynamic load in pavement analysis and design.