Trenchless excavation refers to the use of a variety of geotechnical drilling equipment and technical means, through the guide, directional drilling, etc. in the case of a small part of the excavation of the surface (generally refers to the entrance and exit small area excavation), laying, replacement And repair all kinds of underground pipeline construction of new technologies, will not hinder the traffic, will not destroy the green space, vegetation, will not affect the shops, hospitals, schools and residents of the normal life and work order, to solve the traditional excavation construction of the residents Interference, the traffic, the environment, the surrounding building foundation damage and adverse effects, and therefore has a high social and economic effects.