To　investigate　the　influence　mechanism　and　law　of　shear　span　ratio　on　the　shear　resistance　and　failure　mechanism　of　CFRP　(carbon　fiber　reinforced　polymer)　strengthened　RC　(reinforced　concrete)　shear　wall,　a　three-dimensional　numerical　model　of　CFRP-strengthened　RC　shear　wall　was　established,　considering　the　Hashin　damage　criterion　and　the　Cohesive　model.　Firstly,　the　accuracy　of　the　numerical　simulation　method　was　verified　by　the　existing　experimental　data.　Then,　the　failure　modes,　shear　bearing　capacity,　and　ductility　coefficient　of　CFRP-strengthened　RC　shear　wall　under　different　shear　span　ratios　and　CFRP　wrapping　methods　were　studied.　Further,　the　influence　law　of　shear　span　ratio　and　wrapping　method　on　the　CFRP　shear　contribution　and　strengthened　efficiency　were　analyzed.　The　results　show　that:　with　the　increase　in　shear　span　ratio,　the　shear　bearing　capacity　of　CFRP-strengthened　RC　shear　wall　decreases,　and　the　CFRP　shear　contribution　and　the　strengthened　efficiency　were　significantly　weakened.　Additionally,　under　the　same　shear　span　ratio,　RC　shear　walls　strengthened　by　horizontal　strips　will　improve　the　efficiency　of　shear　strength　by　1.0~3.0　times,　and　the　improved　efficiency　of　ductility　coefficient　was　increased　by　0.8~2.4　times,　compared　with　double-sided　and　full-wrapped　strengthened　methods.　©　2024　Tsinghua　University.　All　rights　reserved.