Abstract: Aiming at the problem of ultra-high-altitude roadway crossing in ultra-thick coal seam working face of gas co-mining area represented by Yulin area, theoretical analysis, numerical simulation and field measurement are used to analyze and study the reasonable support strength of empty roadway and the deformation law of surrounding rock during passing through empty roadway. The results show that : When employing the combined “gangue filling + concrete column” support system, the required support intensity for a 10m super large mining height working face crossing 7.5m super high goafs should not be less than 2.1 MPa Under the influence of mining, the surrounding rock of the empty roadway begins to accelerate deformation at 60 m ahead of the working face, and the mining intensity increases with the shortening of the working face distance. Under optimal support loading, roof deformation remains substantially smaller than sidewall displacement, indicating superior vertical stability of the reinforced roof structure. In the field industrial test : hierarchical classification of filling necessity was implemented for different goaf sections based on periodic weighting patterns, enabling determination of rational filling ranges. Specific construction parameters for the "concrete column" support system were optimized through theoretical calculations The results show that during the period of the working face passing through the empty roadway, the surrounding rock in the range of the roadway and the front roof of the working face is basically intact, and there is no local roof fall and large-area weighting in the working face. The control of the roof surrounding rock during the passing through the empty roadway has achieved ideal results.