The road roller, also known as the earth press, is a kind of road repair equipment. Road rollers belong to the category of road equipment in construction machinery, and are widely used in filling compaction operations of large-scale engineering projects such as high-grade highways, railways, airport runways, DAMS, stadiums, etc. They can roll sand, semi-viscous and cohesive soil, subgrade stable soil and asphalt concrete pavement layer. The roller is suitable for various compaction operations by the gravity of the machine itself, so that the rolled layer has permanent deformation and compactness. The roller is divided into two categories: steel wheel type and tyre type.