Representative　volume　element　with　random　distribution　pattern　has　been　built　and　applied　to　study　and　analyze　the　macro　mechanical　properties　of　the　carbon　black　filled　rubber　composites　by　the　micromechanical　finite　element　method.　Numerical　simulations　for　the　uniaxial　compression　case　have　been　made　by　two-dimensional　plane　strain　model.　The　periodic　boundary　conditions　are　imposed　on　each　representative　volume　element　in　order　to　ensure　the　compatibility　of　the　deformation　field.　The　dependence　of　the　macroscopic　stress-strain　behavior　and　the　effective　elastic　modulus　of　the　composites,　on　particle　distribution　pattern,　particle　size,　particle　stiffness　and　particle　volume　fraction　has　been　investigated　and　discussed.　It　is　shown　that　the　stiffness　of　the　composite　is　increased　considerably　with　the　introduction　of　carbon　black　filler　particles,　and　for　the　filler　content　of　0.2513,　the　effective　elastic　modulus　of　the　composite　is　more　than　double　the　initial　modulus　of　rubber.　It　is　also　shown　that　the　effective　elastic　modulus　of　the　composite　is　increased　with　the　increase　of　the　particle　volume　fraction.