Basalt　fiber　reinforced　concrete　(BFRC)　can　be　regarded　as　a　composite　of　cement　mortar,　aggregate　and　basalt　fiber.　In　this　paper,　the　influences　of　the　basalt　fiber＇s　length　and　content　on　the　fundamental　mechanical　properties　of　concrete　were　investigated　by　multi-scale　simulation.　At　the　mesoscopic　scale,　a　damage　constitutive　model　was　developed　in　accordance　with　the　Mori-Tanaka　homogenization　theory　and　progressive　damage　theory　to　predict　the　composited　material　properties　of　BFRC.　At　the　macroscopic　scale,　the　obtained　material　properties　of　BFRC　from　mesoscopic　were　input　into　the　finite　element　specimen　model　to　simulate　the　mechanical　performance　of　BFRC.　By　coupling　the　mesoscopic　material　model　with　the　finite　element　macroscopic　model,　the　effects　of　basalt　fiber　on　the　mechanical　performance　of　BFRC　specimen　at　macroscopic　scale　can　be　investigated.　The　compressive,　splitting　tensile,　and　bending　performances　of　BFRC　were　studied　by　both　experiments　and　numerical　simulation.　The　predicted　results　from　the　proposed　multiscale　model　show　a　good　agreement　with　the　experimental　results.　It　is　also　found　that　with　the　increase　of　fiber　content,　the　compressive　and　splitting　tensile　strengths　of　concrete　increase　first　followed　by　decrease　while　the　bending　strength　keeps　increase.　For　the　different　lengths　of　basalt　fiber,　the　BFRCs　with　6　mm　basalt　fiber　display　a　better　compressive　and　splitting　tensile　performance　than　BFRCs　with　12　mm　fiber,　whereas　the　differences　in　bending　strength　is　slight.　Results　shows　that　BFRCs　with　2　parts　per　thousand　6　mm　basalt　fiber　can　achieve　the　maximum　strength.　Moreover,　the　size　effect　on　BFRC＇s　basic　properties　of　BFRC　with　2　parts　per　thousand　6　mm　basalt　fiber　was　further　explored　by　regression.　Those　regression　formula　has　very　high　R-2　values.　(C)　2019　Elsevier　Ltd.　All　rights　reserved.