In the drilling process of complex deep wells, excessive torque and drag may lead to the difficulty of direction or even sticking. Moreover, if the drilling tools were affected by axial stress, bending stress, shearing stress or buckling stress, fatigue failure might be caused as well as some relevant problems stemming from the inadequate hole cleaning. In order to meet the requirement of deep well drilling, Petrochina Jidong oilfield company introduced the application of COMPASS and WELLPLAN (LANDMARK), which has made the abstract concrete and digitized. This method preferably satisfied the drilling demand of No.3 structure, and at the same time effectively reduced the accident incidence, demonstrably improved the productivity and significantly lowered the drilling costs.