Abstract: This article provides a brief overview of the basic working principle of non excavation technology horizontal directional drilling（pipe pulling）. An engineering example of using horizontal directional drilling（pulling pipes） for construction in complex soil and rock alternating strata was listed. Referring to the geotechnical accidents that occurred in directional drilling engineering cases in similar soil layers, the possible geotechnical problems that may occur in this engineering example were predicted. Then the advantages of grouting reinforcement measures, the comparison and selection of grouting materials, were elaborated. Grouting reinforcement treatment was divided into two sections based on the lithology of the formation. In the calculation process of grouting amount, the values of pore ratio parameters for different lithology formations were analyzed and compared, and the total grouting amount was predicted and calculated based on relevant standard formulas. Through construction verification, it was found that the directional drilling method was effective in crossing the ground after grouting reinforcement, without any settlement or deformation effects on the crossing roads and railways. The final grouting amount was basically consistent with the calculation results of the design plan.