This　paper　mainly　investigates　the　fracture　parameters　of　Basalt　Fiber　Reinforced　Concrete　(BFRC)　with　various　fiber　lengths　and　dosages　using　Double-K　fracture　model.　The　model　was　developed　by　fracture　criterion　using　ABAQUS　Virtual　Crack　Closure　Technique　(VCCT),　and　the　results　of　the　model　and　experiments　were　compared.　The　basalt　fiber　with　length　of　6　mm　and　12　mm　was　added　into　concrete　in　the　dosage　of　0.0%,　0.1%,　0.2%,　0.3%,　0.4%,　and　0.5%　by　volume　of　concrete,　respectively.　Concrete　specimens　were　cast　into　three　dimensions,　i.e.,　60　mm　x　180　mm　x　480　mm,　80　mm　x　240　mm　x　640　mm,　and　100　mm　x　300　mm　x　800　mm.　Then,　three-point　bending　test　was　conducted　on　precast-notched　beams.　The　load　versus　cracking　mouth　opening　displacement　(P-CMOD　curve)　was　developed　in　order　to　evaluate　cracking　and　breaking　load.　The　initial　fracture　toughness　and　unstable　fracture　toughness　were　derived　from　the　Double-K　fracture　model　aimed　to　optimize　the　fiber　length　and　dosage.　The　results　showed　that　the　initial　fracture　toughness　and　unstable　fracture　toughness　increased　first　and　then　decreased　with　the　increase　in　fiber　dosage,　and　basalt　fiber　with　length　of　6　mm　and　dosage　of　0.2%　performed　the　best　toughening　effect　on　concrete.　The　comparison　results　showed　that　numerical　simulation　can　better　simulate　the　initiation　and　propagation　of　BFRC　fractures　and　achieve　the　dynamic　propagation　process　of　fractures.