A　dual-mesh　three　characteristic　lines　method　was　proposed　for　stress　wave　propagation　through　a　microdefected　rock　mass　containing　a　thin-layer　filled　macrojoint.　The　dual-mesh　three　characteristic　lines　are　composed　of　five　basic　elements　that　are　used　to　calculate　stress　wave　propagation　at　the　boundary　and　the　interior　of　the　microdefected　rock　mass　and　the　left　side,　interior　and　right　side　of　the　filled　macrojoint.　The　results　of　the　present　study　were　compared　with　that　of　available　analytical　results　that　do　not　consider　microdefects　and　do　not　consider　microdefects　and　macrojoint　thickness.　The　results　show　that　the　proposed　method　can　be　used　to　efficiently　investigate　the　effect　of　microdefects　and　filled　macrojoints　on　wave　propagation.　The　results　also　show　that　the　viscosity　coefficient　in　the　equivalent　viscoelastic　model　of　the　microdefected　rock　mass,　the　viscosity　coefficient　in　the　equivalent　viscoelastic　model　of　the　filled　macrojoint　and　the　thickness　of　the　filled　macrojoint　have　significant　effects　on　stress　wave　attenuation.　The　transmission　coefficient　initially　decreases　and　then　increases　as　the　viscosity　coefficient　in　the　equivalent　viscoelastic　model　of　the　microdefected　rock　mass　increases.　The　transmission　coefficient　increases　and　then　tends　to　flatten　as　the　viscosity　coefficient　in　the　equivalent　viscoelastic　model　of　the　filled　macrojoint　increases.　The　transmission　coefficient　decreases　as　the　thickness　of　the　filled　macrojoint　increases.