Based　on　the　multi-step　relaxation　stretching　cyclic　loading　and　unloading　test　of　the　natural/styrene-butadiene　rubber　blends　(NSBR)　in　room　temperature,　under　the　automatic　control　testing　machine　of　AG　in　Japan,　the　parameters　of　the　experimental　data　are　fitted.　The　cross-sections　of　composites　filled　with　different　volume　fractions　of　carbon　particles　were　observed　using　scanning　electron　microscope,　carbon　black　particle　clusters　were　found　when　the　volume　fraction　is　big　enough.　And　a　two-dimensional　multi-particle　random　distribution　RVE　model　is　established,　and　the　ABAQUS　software　was　used　to　simulate　the　interfacial　debonding　behavior　and　aggregation　behavior　of　carbon　black　particles　reinforced　rubber.　The　effects　of　different　carbon　black　volume　fraction　and　different　particle　size　distribution　are　studied　by　numerical　analysis.　If　the　volume　fraction　of　carbon　black　is　larger,　carbon　black　reinforced　rubber　is　easier　to　start　interfacial　debonding　and　the　debonding　strain　is　smaller.　According　to　the　different　aggregation　and　interfacial　debonding　of　carbon　black　particles　for　different　carbon　black　volume　fraction,　there　are　higher　stress　concentration　and　more　prone　to　debonding　in　the　models　with　particles　clusters　than　without　clusters.　The　simulation　results　show　that　the　larger　the　volume　fraction　of　carbon　black,　the　less　the　interfacial　debonding　phenomenon　and　the　particle　clusters　can　be　ignored.　©　2019,　Editorial　Department　of　CJAM.　All　right　reserved.