Fracture　toughness　serves　as　a　key　parameter　in　the　design　and　durability　assessment　of　asphalt　concrete.　Quantifying　the　fracture　toughness　for　fiber-reinforced　asphalt　concrete　(FRAC),　remains　challenging　due　to　the　incorporation　of　fibers.　This　study　proposes　an　improved　method　for　evaluating　the　fracture　toughness　of　FRAC,　based　on　the　double-parameter　theory　derived　from　the　theoretical　concepts　of　stress　intensity　factor　K　and　energy　release　rate　(double-K　and　double-G　fracture　models).　Using　Digital　Image　Correlation　(DIC)　technology,　crack　propagation　during　three-point　bending　beam　tests　on　FRAC　beams　was　measured,　refining　the　calculation　of　critical　crack　length　ac　in　the　double-K　fracture　parameters.　Additionally,　a　method　is　introduced　to　calculate　the　improved　solution　of　double-G　fracture　parameters　by　monitoring　crack　propagation　in　real-time　to　determine　the　effective　crack　length　a,　and　simultaneously　computing　the　energy　absorbed　per　unit　crack　extension,　thereby　constructing　the　J-R　curve　during　stable　crack　growth　phases.　The　fracture　toughness　of　FRAC　is　evaluated　by　the　improved　method　obtained　double-G　fracture　parameters　were　used　in　Virtual　Crack　Closure　Technique　(VCCT)　simulations　to　achieve　virtual　modeling　of　FRAC.　The　results　demonstrate　that　the　improved　method　provides　accurate　fracture　performance　indicators　for　FRAC.　Moreover,　the　study　establishes　modified　calculation　formulas　for　(GICu)　and　(KICu)　at　unstable　fracture　toughness　for　FRAC　at　different　temperatures,　considering　various　fiber　types　and　contents,　thereby　enhancing　computational　efficiency　for　practical　applications.　This　research　contributes　to　more　accurate　and　effective　methods　for　testing　and　evaluating　the　fracture　performance　of　FRAC.　©　2024　Elsevier　Ltd