During the drilling of several geothermal wells in Chongqing urban area and surrounding villages and towns, conventional drilling methods cannot guarantee the borehole inclination after entering the Triassic Xujiahe Formation to reach the standard due to factors such as the large formation dip angle, frequent lithological changes; thus affecting the success rate of obtaining geothermal water resources. When directional drilling tools are used for deviation correction drilling, the selection of the tool face and borehole azimuth change value of the drilling tool has a particularly important impact on the borehole trajectory. At the same time, when the tool face of the drilling tool is determined, drilling a new borehole is also influenced by formation lithology. In order to smooth the well trajectory and avoid the creation of dog legs, this paper analyzes a geothermal well drilling case with directional technology , sums up the field experiences, and optimizes the controllable factors of the directional drilling well trajectory.