The　asphalt　binder　is　exposed　to　unfavorable　coupling　aging　of　UV　radiation,　high　temperature,　and　moisture,　which　accelerates　the　deterioration　of　the　binder＇s　rheological　properties.　To　investigate　the　effect　of　this　coupled　aging　on　the　rheological　properties　of　asphalt　binder,　an　accelerated　environmental　aging　oven　considering　ultraviolet　(UV)　radiation,　temperature,　and　moisture　was　used　in　this　paper　to　carry　out　multifactor　coupling　aging　tests　for　the　binder.　The　coupling　aging　test　parameters　are　determined　by　the　central　composite　design-response　surface　methodology　(CCD-RSM).　The　rheological　properties　of　asphalt　binder　before　and　after　aging　were　examined　by　dynamic　shear　rheometer,　and　the　effects　of　the　coupling　aging　on　the　viscoelastic,　high-temperature,　fatigue,　and　low-temperature　properties　of　the　binders　were　evaluated　by　employing　the　complex　shear　modulus　(G*);　the　aging　index　(GI),　which　was　established　with　G*;　the　rutting　factor　(G*/sin);　the　Glover-Rowe　(G-R)　parameter;　and　the　ratio　of　asphalt　binder　creep　rate　to　stiffness　modulus　(m/S),　respectively.　Further,　the　effect　of　the　coupling　aging　on　the　chemical　properties　of　the　asphalt　binder　was　evaluated　with　carbonyl　index　obtained　from　the　Fourier　transform　infrared　spectrometer.　The　results　showed　that　the　optimal　values　(temperature:　68.3°C;　irradiation　intensity:　2,221　W/m2;　spraying　interval:　250　min)　of　the　coupled　aging　parameters　were　determined　by　the　CCD-RSM,　and　the　relationship　between　the　coupled　aging　time　and　the　carbonyl　index　was　established　by　the　Verhulst　model　with　an　R2　value　larger　than　0.98.　As　the　coupling　aging　degree　increases,　the　G∗,　GI,　and　G∗/sin　show　an　increasing　trend,　whereas　the　G-R　parameter,　m/S,　shows　a　decreasing　trend,　indicating　that　the　aging　increases　the　stiffness　and　high-temperature　resistance　of　the　binder　and　decreases　its　fatigue　properties　and　low-temperature　properties.　Based　on　the　correlation　analysis,　the　G-R　parameter　showed　good　correlation　with　the　GI,　G∗/sin　(45°C,　55°C,　and　65°C),　m/S　(-6°C,　-12°C,　and　-18°C),　respectively,　and　the　average　R2　value　is　larger　than　0.98.　Therefore,　the　G-R　parameter　can　be　used　as　a　comprehensive　index　for　evaluating　the　rheological　properties　of　binders.　©　2024　American　Society　of　Civil　Engineers.