The drilling trajectory can be precisely controlled by directional drilling technology to meet the requirements of geological structural exploration in Hudi coal mine. Four quasi-directional drilling boreholes has been constructed by ZDY6000LD directional drilling rig to accurately prospect coal seam strikes in main and auxiliary transport cross-hole, which provides a basis for coal mining, extraction and digging. The paper introduces the design basis of the directional geological structural exploration hole in Hudi coal mine and the drilling technology.