The　shear　behavior　of　concrete　beams　reinforced　with　U-shaped　high　strength　steel　wire　mesh　at　different　prestress　levels　with　new　tension　and　anchor　system　is　investigated.　Six　beams　reinforced　with　high　strength　steel　wire　mesh　at　different　prestress　levels　and　shear　span　to　depth　ratio　of　2.2　and　1.65　(3　specimens　for　each　ratio)　were　tested　and　compared　with　one　reinforced　concrete　beam　without　high　strength　steel　wire　mesh.　The　results　show　that　the　load　capacity　and　the　stiffness　of　beams　reinforced　with　prestressed　steel　wire　mesh　increase　with　the　prestress　level　of　the　steel　wire　mesh.　If　the　prestress　level　is　greater　than　0.3,　the　increase　rate　of　the　load　capacity　is　reduced.　A　model　to　predict　the　shear　capacity　of　the　beams　is　proposed.　The　predicted　results　using　this　model　are　in　good　agreement　with　the　experiment　results.　The　proposed　model　can　be　used　for　theoretical　analysis　and　design　of　concrete　beams　strengthened　with　prestressed　steel　wire　mesh.