The　capacities　and　crack　resistance　of　reinforced　concrete　(RC)　members　are　the　main　factors　affect　the　safety　and　serviceability　of　RC　structures.　To　investigate　the　mechanical　properties　and　crack　resistance　of　RC　beams　strengthened　with　textile　and　modified　concrete,　theoretical　analysis　and　experimental　study　have　been　carried　out.　Firstly,　the　theoretical　calculation　methods　of　the　load-deflection　curve　and　flexural　capacity　of　RC　beam　strengthened　with　textile　and　modified　concrete　are　proposed　through　the　force　analysis　of　cross-section.　Then,　the　shear　capacity　calculation　method　based　on　the　truss-arch　model　and　the　crack　width　calculation　method　based　on　the　bond-slip　theory　is　proposed　through　the　overall　force　analysis.　Finally,　twelve　beams　were　designed　and　manufactured　for　four-point　loading　test.　The　test　variables　include　the　carbon　textile,　anchorage　measures,　modified　concrete　types　and　modified　concrete　pouring　thickness.　The　capacity　test　results　indicate　that　the　specimens　strengthened　with　textile　and　modified　concrete　have　excellent　mechanical　properties　and　crack　control　ability.　Anchoring　the　carbon　textile　can　effectively　avoid　debonding　failure.　The　modified　concrete　pouring　thickness　has　a　minor　effect　on　the　flexural　capacity　of　the　specimen　if　it　exceeds　a　certain　value.　The　accuracy　of　theoretical　calculation　methods　proposed　by　the　theoretical　analysis　in　this　study　is　proved　according　to　the　experimental　results　and　numerical　analysis　results.