Abstract: Horizontal well technology plays an important role in unconventional oil and gas exploration and development, but it has the characteristics of long horizontal section, low well pattern control degree and smooth trajectory, which brings great difficulties for geosteering. Therefore, in this paper the geosteering design preparation, the trajectory adjustment before casing windows sidetracking and the direction of horizontal section have been respectively discussed. On the basis of the discussion, the technology methods on A target depth determination, azimuth gamma of horizontal section and imaging direction have been further discussed. The application results show these methods have achieved good effects in Bi-ye HF1 well.