The　metal　transfer,　welding　current,　arc　voltage　and　operational　performance　of　the　three　kinds　of　self-shielded　flux　cored　wires　were　studied　by　using　high-speed　photography,　arc　parameters　rapid　acquisition　and　analysis　system,　as　well　as　operational　performance　test　method.　The　following　conclusions　have　been　drawn　in　this　experimental　condition,　the　bridging　transfer　without　arc　interruption　of　self-shielded　flux-cored　wire　can　be　characterized　with　the　voltage　value　less　than　17.5　V　for　more　than　0.5　ms,　and　its　frequency　can　also　be　calculated.　The　calculated　characteristic　value　t50　which　was　used　to　characterize　the　duration　of　the　transition　can　be　used　to　describe　the　quality　of　bridging　transfer　without　arc　interruption　of　self-shielded　flux-cored　wire.　The　quantity　and　quality　of　bridging　transfer　without　arc　interruption　are　the　main　factors　to　determine　the　operational　performance　of　self-shielded　flux-cored　wire.　The　more　the　numbers　of　bridging　transfer　without　arc　interruption,　the　longer　the　transition　duration,　the　better　the　operational　performance　is,　which　is　consistent　with　the　operational　performance　test　results.