Recycled　Aggregate　Concrete　(RAC)　is　referred　to　as　Recycled　Concrete　(RC).　In　this　paper,　the　compression　performance　of　recycled　concrete　was　researched　using　the　micromechanics.　The　recycled　concrete　was　taken　as　a　five-phase　composite　material　consisting　of　recycled　coarse　aggregate,　old　hardened　cement　paste,　new　hardened　cement　paste,　the　old　interfacial　transition　zone　(Old　ITZ)　and　the　new　interfacial　transition　zone　(New　ITZ)　on　meso-level.　A　random　aggregate　model　was　used　to　simulate　the　meso-structure　of　recycled　concrete.　The　propagation　process　of　cracks　and　the　mechanical　properties　of　uniaxial　compression　specimens　of　recycled　concrete　were　simulated　using　finite　element　method　(FEM)　with　damage　model.　The　numerical　simulation　results　agree　well　with　the　corresponding　experimental　results.　The　results　show　that　the　specimen　usually　damaged　along　the　old　interfacial　transition　zone　and　the　new　interfacial　transition　zone.