The　developed　wires　were　used　for　gas　metal　arc　welding.　The　chemical　composition,　microstructure,　tensile　strength　and　corrosive　pitting　rate　of　weld　bead　and　Rockwell　hardness,　bend　strength　and　impact　toughness　of　welded　joint　were　investigated.　The　microstructure　of　weld　metal　was　analyzed　by　metalloscope.　The　impact　fracture　was　analyzed　by　scanning　electron　microscope,　and　inclusions　of　impact　fracture　were　analyzed　by　energy　spectrometer.　Experiment　results　indicated　that　it　was　effective　to　add　rational　nickel　and　MnN　in　the　wire　to　accelerate　austenite　formation.　The　influence　factors　of　pitting　corrosion　resistance　and　impact　ductility　were　studied.　It　had　been　found　that,　besides　chemical　constitution,　the　uniform　distribution　of　duplex　phases　in　the　weld　metal　could　improve　pitting　corrosion　resistance.　Elements　Mn,　Ni,　Cr　etc.　were　the　assurance　of　welded　joint　impact　ductility.