1) Water sealing at the micro-surface is a representative preventive and maintenance measure, which can effectively deal with mild diseases of asphalt pavement, improve the flatness, anti-slip performance and anti-seepage performance of the pavement. At the same time, the micrometer technology has the advantages of high efficiency, low pollution and energy saving, but there are shortcomings of excessive noise during driving, and the relevant researchers reduce the impact of noise by incorporating fibers, rubber materials and studying high-viscosity and low-noise micrometers.