As　a　typical　heterogeneous　soil,　the　macro-mechanical　behavior　of　soil-rock-mixture　is　related　with　rock　meso-structure　closely.　Under　applied　loads,　two　kinds　of　load　transfer　mechanism,　i.e.,　rock　structure　system　and　non-structural　soil　matrix　system,　were　developed.　From　load　transfer　path　and　shear　path,　the　structure　effect　of　rocks　were　analyzed.　Then,　the　influence　of　rock　long　axis　angle　on　the　shear　strength　is　identified.　By　treating　the　soil-rock-mixture　as　a　two-phase　composite　composing　by　rock　block　and　soil,　biaxial　compression　mesoscopic　analysis　models　were　established　and　validated.　Then　a　series　of　numerical　tests　with　different　orientation　angles　of　rock　long　axis　were　carried　out.　The　influence　of　orientation　angle　of　rock　long　axis　on　the　macro-mechanical　properties　of　soil-rock-mixture　were　discussed,　including　the　deviator　stress,　internal　friction　angle,　cohension.　The　analysis　results　indicate　that　with　the　increment　of　orientation　angle　of　rock　long　axis　from　0°　to　90°,　the　deviator　stress　and　strength　parameters　all　decrease　initially　and　then　increase.　The　relationship　between　deviator　stress　and　orientation　angel　of　rock　long　axis　can　be　described　as　a　parabolic　curve.　©　2018,　Engineering　Mechanics　Press.　All　right　reserved.