Generally, there will be a lot of small gravel on the water-stable layer because of poor maintenance, which is also commonly known as "shelling" The destruction of the water-stable layer structure will directly affect the engineering quality and service life. Shenghua concrete water-saving and moisturizing curing film can be selected for maintenance. The water retention performance is good, and the humidity of closed curing in the whole curing cycle can reach more than 90%. Effectively restrain micro-cracks, ensure the maintenance quality, and make the maintenance clean and tidy, which is conducive to improving the construction image.