Is a kind of heavy construction machinery, mainly used for land leveling, digging, pushing soil, sand and other bulk materials. It is composed of power system, transmission system, walking system and working device. The main working device is the bulldozer, also known as the "shovel" or "push knife", used for bulldozing, leveling, backfilling and other operations. It is usually provided by a diesel engine, which ensures a strong power output and good adaptability. The walking system includes tracks or tires. The track type bulldozer is suitable for soft or uneven ground, and the tire type is suitable for hard roads. Widely used in construction, road construction, land development, farmland transformation, etc.