This　paper　aims　at　providing　a　sound　theoretical　solution　to　auxiliary　central　hole　and　the　cutting　parameters.　For　this　purpose,　the　forming　mechanism　of　V-cut　cavity　for　cutting　blasting　was　performed　based　on　the　hypothetical　rock　breaking　mechanism　of　V-cut　blasting.　A　theoretical　solution　for　increasing　the　critical　depth　of　the　auxiliary　center　cuthole　and　the　criteria　for　increasing　the　cuthole　diameter　of　various　types　of　cutholes　when　the　rock　attributes,　explosive　properties,　and　cuthole　dip　angle　are　constant　are　proposed.　(1)　If　charging　length　le　<　0.75H/sin　θ,　no　auxiliary　cuthole　is　needed.　(2)　If　0.75H/sin　θ　<　le　<　0.75H/sin　θ　+　(2∼4)　×　0.1,　a　central　vertical　auxiliary　hole　is　needed.　(3)　If　0.75H/sin　θ　+　(2∼4)　×　0.1　<　le　<　0.75(H/sin　θ　+　Hi/sin　θi),　a　shallow　inclined　hole　is　needed.　(4)　If　le　>　0.75(H/sin　θ　+　Hi/sin　θi),　both　the　central　vertical　cuthole　and　the　shallow　inclined　cuthole　are　needed.　Meanwhile,　the　theoretical　solution　was　verified　by　numerical　modelling　with　ANSYS/LS-DYNA.　Moreover,　the　field　implementation　of　the　V-cut　and　the　auxiliary　hole　effectively　improved　the　blasting　effect　in　both　efficiency　and　economy.　©　2020　Xiaoming　Lou　et　al.