The good smoothness of road surface can ensure a lot of vehicles trafficking in the way of economy,comfort and safety,will extend the use life of a road,and economize the maintenance costs of a road and the upkeep costs of the vehicles passed from the road.The unsmooth longitudinal surface of a road will bring the bigger wheel driving force and speed up the surface of a road to be destroyed.So the economic benefit is very distinct for constructing the smooth road.The cause of an unsmooth road surface is mostly relative to the construction of the road embankment and road surface.Based on this,the method and technology to enhance the smoothness of a road surface are put forward.