The　fissures　are　ubiquitous　in　deep　rock　masses,　and　they　are　prone　to　instability　and　failure　under　dynamic　loads.　In　order　to　study　the　propagation　attenuation　of　dynamic　stress　waves　in　rock　mass　with　different　number　of　fractures　under　confining　pressure,　nonlinear　theoretical　analysis,　laboratory　model　test　and　numerical　simulation　are　used　respectively.　The　theoretical　derivation　is　based　on　displacement　discontinuity　method　and　nonlinear　fissure　mechanics　model　named　BB　model.　Using　ABAQUS　software　to　establish　a　numerical　model　to　verify　theoretical　accuracy,　and　laboratory　model　tests　were　carried　out　too.　The　research　shows　that　the　stress　attenuation　coefficient　decreases　with　the　increase　of　the　number　of　fissures.　The　numerical　simulation　results　and　experimental　results　are　basically　consistent　with　the　theoretical　values,　which　verifies　the　rationality　of　the　propagation　equation.