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Trenchless technology given rised to the 20 centuries in abroad 70’s empress period,as an new construction technique in paving underground tube line .directional drilling come into being the most potential method because it achieve accuracy designed- area on trenchless technology,so it bring great benefit,especially in complexity pipe line area of city.The local Directional drilling is just staring in terrane, the equipments and the technologies can’t satisfy far and far the spot construction needs, according to current circumstance and considing the existed equipments, the author put forward drilling by air hammer in terrane , having designed compounded-drilling tools,and recommended technology parameters.producing experiments have obtained good achievements in economic and in techniques. Making use of this studies the result,the units of construction are able to paving underground pipe tube in terrane,only add a little amount equipments or drilling tools at now already foundation.Drilling track is key factor which decide trenchless success or failure , but controlling drilling track stay around rectifyed phase at the present .guided the theory of force is the key affectting the drilling track ,the paper discuss primary factors on contralling drilling track ,and advance the formulary ahout reckoning deviation force and azimuth force ,expect to achieve the aim that drilling track were controled real time and be anticipated , and have the initiative on drilling track contaolling .
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