Abstract: Aiming at the mining drift of fully mechanized top coal caving working face disrepair problems in the Steeply Dipping Soft Broken Extra Thick coal seam，Further analysising on the reason for the failure of metal mesh bolt anchor cable and shotcrete technology，Based on testing for the installation of supporting materials of specifications and strength for bolt and anchor cable, anchor cable tensioning strength，Bolt pre tightening torque，Supporting force And other related technical parameters in coal mine underground field .At last formed and practiced the supporting key technology of“Three high，Three small，Three timely，Two Coordinated，A let pressure”，Weak parts strengthening，A large tray support the table about bolt, anchor cable, metal net and spray for the mining drift of fully mechanized top coal caving working face in the Steeply Dipping Soft Broken Extra thick coal seam，maked effective control on surrounding rock of the Deep mining drift.

Key words: the Steeply Dipping Thick coal seam, Mining drift, the supporting technology of bolt, anchor cable, metal net and spray, The supporting force of the anchor