Abstract: Asphalt pavement with semi-rigid base is a common pavement structure for high-grade highways in China. Due to the influence of driving load, natural environment and other factors, a large number of pavements have different levels of early damage. Studies have shown that the use of vehicle-mounted drop-weight deflectometer to detect road surface can obtain accurate test data, provide real and effective data for the evaluation of pavement structure performance, and at the same time, have important guiding significance for highway maintenance and repair.Based on this, on the premise of fully understanding the application advantages of vehicle-mounted drop-weight deflectometer, combined with specific cases, the application points of vehicle-mounted drop-weight deflectometer in highway non-destructive testing are analyzed and discussed, with a view to similar projects for reference.