To　investigate　the　strengthening　effect　of　fiber　nets　on　the　seismic　behavior　of　brick　masonry　walls,　carbon　fiber　nets　(CFN),　glass　fiber　nets　(GFN)　and　basalt　fiber　nets　(BFN)　were　applied　to　strengthen　masonry　walls　with　an　external　sticking　method.　Pseudo-static　tests　were　carried　out　on　eight　walls　with　different　strengthening　conditions:　one　was　not　strengthened;　six　were　strengthened　on　one　side　or　both　sides　with　CFN,　GFN　and　BFN,　respectively;　and　one　was　strengthened　with　CFN　on　both　sides　and　then　riveted　with　steel　plates.　The　results　showed　that　fiber　nets　could　exchange　the　failure　mode　of　the　walls　from　shear　failure　to　bending　failure.　The　bearing　capacity,　energy　consumption　and　ductility　of　the　strengthened　walls　were　improved,　and　the　improvement　of　double-sided　reinforcement　was　more　notable.　Epoxy　polymer　mortar　is　more　suitable　for　masonry　structure　strengthened　with　fiber　nets　than　acrylic　polymer　mortar　because　it　can　ensure　the　full　participation　of　fiber　nets.　In　addition,　a　calculation　formula　for　the　design　value　of　seismic　shear　capacity　of　masonry　walls　strengthened　with　fiber　nets　was　deduced,　which　can　effectively　predict　the　shear　capacity　of　walls　strengthened　with　fiber　nets.