Blasting　excavation　of　rock　masses　under　high　in-situ　stress　often　encounters　difficulties　in　rock　fragmentation　and　a　high　boulder　rate.　To　gain　a　deeper　understanding　of　this　issue,　the　stress　distribution　of　rock　masses　under　dynamic　and　static　loads　was　first　studied　through　theoretical　analysis.　Then,　the　ANSYS/LS-DYNA　software　was　employed　to　simulate　the　blasting　crack　propagation　in　rock　masses　under　various　in-situ　stress　conditions.　The　fractal　dimension　was　introduced　to　quantitatively　analyze　the　influence　of　in-situ　stress　on　the　distribution　of　blasting　cracks.　The　results　indicate　that　in-situ　stress　primarily　affects　crack　propagation　in　the　later　stages　of　the　explosion,　while　crack　initiation　and　propagation　in　the　early　stages　are　mainly　driven　by　the　explosion　load.　In-situ　stress　significantly　influences　the　damage　area　and　fractal　dimension　of　cut　blasting.　Under　hydrostatic　in-situ　stress,　as　the　in-situ　stress　increases,　the　damage　area　and　fractal　dimension　of　blasting　cracks　gradually　decrease.　Under　non-hydrostatic　in-situ　stress,　when　the　principal　stress　difference　is　small,　in-situ　stress　promotes　the　damage　area　and　fractal　dimension　of　the　surrounding　rock,　enhancing　rock　fragmentation.　However,　when　the　principal　stress　difference　is　large,　in-situ　stress　inhibits　the　damage　area　and　fractal　dimension　of　the　surrounding　rock,　hindering　effective　rock　breaking.