In　order　to　study　the　mesomechanical　properties　of　recycled　aggregate　concrete　(RAC)　under　uniaxial　tension,　a　numerical　model　of　RAC　with　two　different　aggregate　shapes　(circular　and　convex)　and　five　different　replacement　ratios　of　recycled　aggregate　(0,　30,　50,　70,　and　100%)　was　established.　A　new　finite　element　method-base　force　element　method　(BFEM)　was　used　to　derive　the　element　strain　and　the　element　stiffness　matrix　with　an　explicit　expression　without　Gauss　integral.　The　two-dimensional　numerical　model　of　the　RAC　was　simulated　to　study　the　effect　of　aggregate　shape,　replacement　ratio　of　recycled　aggregate,　aggregate　distribution　and　interfacial　transition　zone　(ITZ)　properties　on　mesomechanical　properties　of　RAC.　Simulation　results　demonstrated　that　once　the　first　crack　appeared,　the　peak　stress　and　peak　strain　were　reached.　The　first　crack　appeared　in　old　ITZ,　which　was　located　in　whether　the　upper　part　or　the　lower　part　of　the　large-size　recycled　aggregate.　The　continuous　cracks　were　mainly　around　the　recycled　aggregate　and　the　aggregate　concentrated　area.　Comparing　with　natural　concrete,　when　the　replacement　ratio　of　recycled　aggregate　was　100%,　the　elastic　modulus　decreased　by　16　similar　to　25%,　the　peak　stress　decreased　by　12　similar　to　15%,　and　the　peak　strain　changed　slightly.　The　ITZ　had　a　significant　influence　on　the　mechanical　properties　of　RAC　and　must　be　considered　in　the　analysis.