The crushing effect of roadway blasting determines whether the blasting parameters are reasonable or not,and its contour forming effect will also affect the stability of surrounding rock of underground mine roadway to a certain extent.Aiming at the problems of overbreak and surrounding rock breakage after blasting caused by excessive charge and dense arrangement of blast holes in roadway driving construction in Xifeng phosphate mine,Guizhou Province,theoretical analysis of rock fragmentation as well as reference to similar engineering experience were adopted to optimize hole spacing,burden and charge structure of tunneling blasting.As a result,six blast holes(two first-order cut holes,two roof holes and two auxiliary holes) were reduced by optimizing cutting method.At the same time,the total number of holes and explosive consumption were decreased by increasing hole spacing and air-deck charge.In addition,the finite element software LS-DYNA was used to analyze the optimized blasting scheme.The results show that the optimized blasting scheme reduces the peak stress and overbreak of roadway surrounding rock which stability is improved.Finally,through 15 groups of on-site practical experiments of tunnel excavation blasting,it is shown that,a good forming quality of tunnel excavation with no roof breakage or cut hole perforation can be achieved after optimizing the blasting parameters.The construction efficiency is improved,while the construction cost is reduced.Finally,it is considered that the blasting vibration can be effectively reduced and the forming quality of roadway can be ensured by properly increasing hole spacing and adopting air-decked charge,compared with the blasting without air decks.