An　experimental　study　and　nonlinear　finite　element　analysis　including　reinforced　concrete　(RC)　beams　and　partial　prestressed　concrete　(PPC)　beams　strengthened　with　CFRP　strips　were　carried　out　under　static　loading.　The　influences　of　damage　degree,　ratio　of　shear　span,　stirrup　ratio,　and　level　of　effective　prestressing　on　the　shear　characteristics　of　these　strengthened　beams　were　investigated.　Some　important　conclusions　were　extracted　from　the　testing　and　numerical　analysis　and　listed　as　follows:　1)　The　inclined　cracking　development　can　be　effectively　restrained　using　the　proposed　strengthening　method　with　CFRP　strips,　and　the　shear　load-carrying　capacity　and　ductility　of　the　strengthened　RC&PPC　beams　can　be　effectively　improved.　2)　The　synclinal　cracking　load,　yielding　loads　of　the　stirrup,　and　the　shear　load-carrying　capacity　of　RC　beams　strengthened　after　the　damage　would　be　enhanced　while　the　ratios　of　shear　span　becoming　smaller　and　stirrup　ratio　becoming　larger.　3)　The　improvements　of　shear　carrying-capacity　of　PPC　beams　strengthened　with　CFRP　strips　would　become　larger　if　the　level　of　effective　prestressing　increasing.　4)　The　proposed　nonlinear　finite　element　(FE)　model　can　better　predict　the　shear　performance　of　strengthened　RC&PPC　beams,　and　the　results　from　FE　model　can　correlate　very　well　with　those　from　testing.　5)　The　strength　of　CFRP　strips　should　be　effectively　reduced　during　the　shear　strengthening　design　of　the　practical　engineering　cases.