Based　on　the　relation　of　macroscopic　and　microscopic　characteristics　of　carbon　black　filled　rubber　composites,　representative　volume　element　with　random　distribution　pattern　has　been　proposed,　the　boundary　conditions　for　the　periodic　microstructures　has　been　discussed,　and　three　dimensional　multi-particles　RVE　numerical　model　has　been　established　to　study　and　analyze　the　macro　mechanical　properties　of　the　carbon　black　filled　rubber　composites　by　the　micromechanical　finite　element　method.　The　research　shows　that　the　compatibility　of　the　deformation　field　and　stress　field　in　macrostructure　are　ensured　by　the　periodic　boundary　conditions,　the　modulus　of　the　rubber　composite　is　increased　considerably　with　the　introduction　of　carbon　black　filler　particles,　and　the　effective　elastic　modulus　of　the　rubber　composite　is　increased　with　the　increase　of　the　carbon　black　particle　volume　fraction.　In　the　simultaneous,　the　results　of　the　prediction　on　the　effective　elastic　modulus　of　the　rubber　composite　made　with　this　numerical　model　are　consistent　with　the　experimental　results,　and　better　than　the　predictions　of　the　model　proposed　by　Bergstrom,　which　demonstrate　that　this　model　can　be　used　for　simulation　analysis　of　effective　properties　of　the　carbon　black　filler　particle　reinforced　rubber　matrix　composites.