Abstract: Aiming at the Steeply Dipping Thick coal seam fully mechanized working face air return Tunnel Fall into disrepair, Originate from gob The upper section goaf gas seepage and Gangue falling In mining period，Based on the broken rock and coal mining, seepage properties of high permeability Darcy, Researched on Pillar Thickness between air return Tunnel and transportation Tunnel (gob)，at last Obtain of the Reasonable layout of air return Tunnel，Divided into four main categories position (I, II, III, IV), two small (Class III - I - II, III).

Key words: Steeply Dipping Thick coal seam, the layout of air return Tunnel, Darcy flow, Pillar Thickness