Photocatalyzed　organic　transformations　have　spurred　immense　interest　in　synthetic　chemistry　for　the　efficient　conversion　of　solar　energy　into　chemical　energy.　However,　the　crucial　roles　of　support,　which　fixes　catalytic　sites　and　improves　the　light-harvesting　ability,　are　often　ignored　in　photoredox　transformations.　Herein,　we　report　the　utilization　of　spherical　SiO2　support　to　engineer　AuPd　alloy　particles　(denoted　as　AuPd/SiO2),　conceptually　different　from　traditional　methods　for　tuning　optical　absorption　of　plasmonic　Au　or　AuPd　particles,　to　manipulate　light-harvesting　ability　of　AuPd　particles　for　highly　selective　and　efficient　photocatalytic　Suzuki　cross-coupling　reactions.　In　this　deliberately　designed　system,　typically　without　the　size　and　shape　alternation　of　AuPd　particles,　the　supported　AuPd　particles　recycle　the　scattering　light　from　spherical　SiO2　support　and　achieve　the　significant　broad　light-harvesting　ability　instead　of　the　surface　plasmon　resonance　peak　The　engineered　AuPd/SiO2　composites　by　the　use　of　near-field　scattering-promoted　optical　absorption　showcase　the　remarkably　enhanced　activity　for　visible-light-induced　photocatalytic　Suzuki　cross-coupling　reactions　in　comparison　with　that　using　commercial　SiO2　support,　highlighting　the　spherical-support-effect　induced　efficient　utilization　of　scattered　light.　This　work　highlights　the　feasibility　of　manipulating　the　light-harvesting　capability　of　bimetallic　particles　by　the　near-field　scattering-promoted　optical　absorption　model　toward　efficient　photo-driven　Suzuki　cross-coupling　reaction　and　other　C-C　coupling　organic　synthesis　to　produce　high　value-added　chemicals.