This　study　concerns　the　improvement　of　the　synergetic　catalytic　efficiency　of　Au-TiO2　nanorods　considering　the　local　surface　plasmon　resonance　(LSPR)　effect　of　different　Au　nanoparticles　(NPs).　The　absorption　spectrum　and　selective　absorption　efficiency　for　visible　light,　the　local　electric　field,　and　the　generated　thermal　effect　are　specifically　analyzed　based　on　the　multifield　decoupling　of　LSPR-assisted　Au-TiO2　catalysts.　The　simulation　results　show　that　the　extinction　spectra　of　both　spherical　and　ellipsoidal　Au　particles　are　consistent　with　the　experimental　data.　Interestingly,　the　latter　is　characterized　by　significant　bimodal　resonance　modes.　Comparatively,　the　simulation　results　show　that　the　longitudinal　mode,　which　is　sensitive　to　the　aspect　ratio,　is　more　favorable　for　the　improvement　of　the　photocatalytic　activities.　It　is　found　that　the　resonance　peaks　are　highly　controllable,　and　are　linear　to　the　particle　size　and　aspect　ratio.　Meanwhile,　the　electric　field　mode　of　TiO2　is　significantly　increased　under　the　resonance　wavelength.　It　is　worth　mentioning　that　the　superposition　effect　makes　a　non-negligible　impact　on　the　actual　catalysts,　leading　to　a　relative　shift　of　resonance　wavelength.　The　consideration　of　the　hot　spots　caused　by　the　superposition　effect　influence　the　photocatalytic　results　significantly,　providing　values　in　diminishing　the　inadaptability　of　the　theory　in　near-touching　regions　of　plasma　particles.