Horizontal directional drilling is based on advanced non excavation technology "philosophy of design and development of new underground pipeline construction engineering machinery, the device with hydraulic and power drive technology, realize the drill forward, rotating, to expand, pull back and a walking device driver etc. function, mainly used in the crossing of railway, roads, buildings, rivers, and in cultural preservation district, downtown urban areas and crops and vegetation in protected areas etc. are not easy to excavate the conditions, water, gas, electricity, telecommunication cable, natural gas, oil and other pipeline laying and maintenance.