Compared with crawler excavator, it is more flexible. It is a suitable for urban construction, and a building machine for tire walking. The wheel excavator is suitable for high-speed and long-distance self turning. The speed can reach 28KM/H in general, and the flexible characteristics can quickly replace all kinds of operation devices. The characteristics is protecting the road surface, and it is suitable for hard ground construction. Wheeled excavators are applied to urban tap water, municipal and pipeline maintenance engineering, civil engineering, industrial materials handling, tunnel excavation, water conservancy projects, urban demolition and so on.