Abstract: Aiming at the problem of long-distance roadway tunneling under the extremely close goaf area, the excavation of 1-2 down 205 tailgate in 1-2 coal composite area of Huojitu Coal Mine as the background. Using the combination of numerical calculation, theoretical analysis and engineering practice, the reasonable interburden spacing and support parameter determination under extremely short distance conditions are analyzed. The research shows that: based on FLAC3D numerical simulation, the long-distance roadway layout and support structure under the goaf are simulated and calculated, compared and analyzed the roadway surrounding rock deformation and stress distribution under different coal pillar widths, interburden spacing and support methods. The reasonable roadway stagger distance should be greater than 17m. Considering the safety factor, the roadway stagger distance is determined to be 21m. When the layer spacing is small , the support effect of anchor bolts and cables is poor, the roof is in a state of tensile failure during the excavation, and the roof control is difficult, so a reasonable layer spacing should be greater than 3m. Under the existing support conditions, when the thickness of the top coal is 3.5m, the displacement of the roof and floor of the roadway changes little, and no scaffolding is required. The theoretical calculation shows that the maximum damage depth of the upper layer to the floor is 2.02m, and when the thickness of the coal beam is 3.5m, the support strength check meets the requirements. According to the field engineering application and the actual measurement of the surrounding rock deformation, when the thickness of the top coal is 3.5m, the joint support method of "bolt-bolt-cable-steel beam-shotcrete" is adopted, the displacement of the roof and floor of the roadway changes little, and the maximum sinking of the roof is 20mm, the roof control effect is good, there is no large-scale roof caving or side slab phenomenon in the roadway, which verifies the rationality of the roadway layout and support scheme.