Complex　rock　mass　(wave　impedances　on　two　sides　of　the　joint　are　different)　commonly　exists,　which　results　in　the　propagation　direction　induced　difference　of　transmission　coefficient　(PDIDTC).　The　PDIDTC　is　defined　as　the　difference　ratio　of　two　transmission　coefficients　of　waves　in　two　opposite　directions.　The　present　paper　further　studied　the　displacement　discontinuous　method　to　investigate　the　PDIDTCs　of　particle　velocity　and　stress　in　the　complex　rock　mass.　A　modified　SHPB　test　was　conducted　to　validate　the　theoretical　results.　The　effects　of　incident　wave　frequency　and　joint　stiffness　on　the　PDIDTC　were　discussed.　Two　cases　of　PDIDTC　of　blast　wave,　rectangular　pulse　and　triangular　pulse　were　illustrated.　The　results　show　that　the　PDIDTCs　of　particle　velocity　and　stress　are　not　influenced　by　the　frequency,　joint　stiffness　and　waveform,　but　are　influenced　by　the　wave　impedance　ratio　significantly.　Moreover,　obvious　PDIDTC　can　be　obtained　when　the　wave　propagates　through　complex　rock　mass,　which　cannot　be　ignored　during　rock　dynamic　analysis.