Road roller, also known as compactor, is a kind of road repair equipment. Roller belongs to the category of road equipment in construction machinery. It is widely used in high-grade highway, railway, Airport runway, dam, stadium and other large-scale engineering projects. It can roll sand, semi-cohesive and cohesive soil, roadbed stabilized soil and asphalt concrete pavement. Roller is suitable for all kinds of compaction operations by the gravity of the machine itself, which makes the rolled layer permanent deformation and compaction. The roller is also divided into two types: steel wheel type and tyre type.