CFRP　(Carbon　Fiber　Reinforced　Plastics)　debonding　jeopardizes　structural　reinforcement　in　engineering　projects.　Anchoring　CFRP　paste　is　crucial　for　efficient　shear　strengthening.　This　study　investigates　the　anchoring　effect　on　shear　resistance　in　nine　CFRP　U-wrapped　concrete　beams,　varying　shear　span-to-depth　ratios　(1.0,　1.5,　2.0),　and　depths　from　300　mm　to　900　mm.　Concurrently,　nine　unanchored　beams　and　nine　plain　concrete　beams　were　included　in　the　comparison,　considering　the　influence　of　beam　depth　and　shear　span　ratio,　referencing　the　prior　research　of　Jiang　et　al.　(2022).　The　evaluation　of　the　shear　contribution　of　CFRP　with　different　sizes,　particularly　in　scenarios　involving　large　dimensions　and　diverse　shear　span　ratios,　was　conducted.　The　test　results　revealed　that　the　anchoring　effect　is　most　pronounced　in　small-scale　beams　with　a　large　shear　span　ratio,　demonstrating　an　improvement　of　over　60%　compared　to　the　CFRP　shear-strengthened　beam　without　anchoring.　In　contrast　to　beams　without　CFRP　wrapping,　the　shear　performance　was　enhanced　by　approximately　90%.　Additionally,　the　study　analyzed　and　compared　the　calculation　formulas　of　shear　capacity　from　different　national　specifications.　Ultimately,　a　calculation　method　for　CFRP　shear　resistance　was　established　and　its　accuracy　was　verified.　©　2024　ICE　Publishing.　All　rights　reserved.