The road surface is a layered structure paved with various mixed materials on the top of the road surface of the roadbed, which can be used by vehicles and pedestrians. The existence of the road surface structure protects the roadbed and makes the roadbed avoid the direct contact between the vehicles and the atmosphere, it can effectively ensure the strength and stability of the roadbed.The pavement structure has a higher proportion than the roadbed in the road construction cost. The pavement structure must be carefully designed and constructed so that the roadbed and pavement can have longer service performance and can effectively save economic investment, is to make the road design more economical.