The　base　force　element　method　(BFEM)　on　potential　energy　principle　is　used　to　analyze　recycled　aggregate　concrete　(RAC)　on　mesolevel.　The　model　of　BFEM　with　triangular　element　is　derived.　The　recycled　aggregate　concrete　is　taken　as　five-phase　composites　consisting　of　natural　coarse　aggregate,　new　mortar,　new　interfacial　transition　zone　(ITZ),　old　mortar,　and　old　ITZ　on　meso-level.　The　random　aggregate　model　is　used　to　simulate　the　mesostructure　of　recycled　aggregate　concrete.　The　mechanics　properties　of　uniaxial　compression　and　tension　tests　for　RAC　are　simulated　using　the　BFEM,　respectively.　The　simulation　results　agree　with　the　test　results.　This　research　method　is　a　new　way　for　investigating　fracture　mechanism　and　numerical　simulation　of　mechanics　properties　for　recycled　aggregate　concrete.