Stress　wave　propagation　through　double-scale　discontinuous　rock　masses　considering　unloading　behavior　was　investigated.　The　piecewise　linear　loading　and　unloading　models　of　macrojoint　were　proposed,　which　were　combined　with　a　split　three-characteristics　mothed　to　investigate　the　stress　wave　transmission　properties.　The　effects　of　the　waveform,　frequency,　amplitude　and　propagation　distance　on　the　energy　and　amplitude　transmission　coefficients　were　discussed.　The　results　of　the　present　study　were　compared　with　the　traditional　study　that　considered　single-scale　discontinuities.　The　results　show　that　the　present　study　can　effectively　analyze　the　effect　of　the　waveform,　frequency,　amplitude　and　propagation　distance　on　the　energy　and　amplitude　transmission　coefficients.　The　energy　and　amplitude　transmission　coefficients　for　rectangular　wave　are　the　largest,　while　those　for　triangular　wave　are　the　smallest.　The　energy　and　amplitude　transmission　coefficients　decrease　as　frequency　and　propagation　distance　increase.　The　energy　and　amplitude　transmission　coefficients　increase　as　the　amplitude　increase.　The　results　also　show　that　the　effect　of　macrojoint　unloading　effect　and　microdefect　on　wave　transmission　can　be　considered　comprehensively　in　the　present　study.　The　unloading　effect　of　macrojoint　causes　the　smaller　energy　transmission　coefficient,　while　it　does　not　affect　the　amplitude　transmission　coefficient.　The　microdefects　cause　smaller　energy　and　amplitude　transmission　coefficients.