In view of the complicated problem of determining the optimal parameters of cross-cut coal blasting cutting technology in coal-measure strata tunnels,taking the Guigala Tunnel of Tibet′s Laze Highway as the research object,theoretical analysis is used to determine that the cross-cut coal cutting section of the tunnel adopts hollow holes.Straight-cut,and analyzed the three kinds of hollow mechanical effects of the hollow holes;The numerical simulation test method is used to establish the calculation model of straight hole cut in stone gate tunnel,and different cut parameters were analyzed from the aspects of cut efficiency,cut depth and dynamic response of coal seam.The results show that with the increase of the key parameter of cutting a=24 cm to a=32 cm,the rock fragmentation degree of the trough cavity decreases,the coal body fragmentation degree is equivalent,and the thickness of the rock that is not penetrated between the blast hole and the hollow hole increases,which reduces the efficiency of cutting; When a=28 cm,the local coal uncovering depth is too large,which increases the risk of outburst; when a=32 cm,there is a loose zone in the deep part of the coal body,which reduces the stress intensity of the deep coal body.Different a has little influence on the dynamic action of the roof of the large section coal measure strata tunnel.The optimal value of the key parameters of the hollow-hole straight-hole cutting in the cross-cut coal blasting of the coal-measure formation tunnel was obtained.The recommended value of the distance between the blast hole and the empty hole is 24 cm,and the recommended value of the hole radius is 100 mm.Finally,the on-site blasting was completed.The test shows that the rock mass is uniformly broken after blasting,the cutting effect is good,and the coal uncovering depth is appropriate.The test results are close to the theoretical research results,which verify the reliability of the research results.