The　fluxless　fusion　welding-brazing　result　between　6061　aluminum　alloy　and　galvanized　steel　with　filler　material　is　studied　by　using　rectangular　laser　beam.　The　dependence　of　the　mechanical　properties　on　solidification　behavior　is　established　based　on　the　joint　formation　and　the　weld　microstructure.　The　results　indicate　that　a　fusion　welding-brazing　weld　of　AA6061　and　galvanized　steel　without　flux　can　be　achieved　using　the　welding　with　filler　powder.　By　optimizing　the　welding　parameters,　the　favorable　weld　without　crack　and　porosity　can　be　achieved.　The　weld　width　and　the　thickness　of　intermetallic　compounds　layer　increase　with　laser　energy　input　increasing.　The　intermetallic　in　the　weld　is　composed　of　Al-Fe　and　Al-Fe-Si　system　phases.　Specimens　are　fractured　at　the　weld/steel　interface　with　the　brittle　characteristic　during　tensile　test.　The　weakness　of　the　joint　is　the　weld　interface.　The　maximum　intensity　of　152.5　N/mm　is　obtained.　Al5Fe2Zn0.4　and　α-Al　are　found　in　the　fracture　surface　on　the　aluminum　side.　The　intensity　of　joint　is　both　determined　by　weld　width　and　the　thickness　of　intermetallic　compound　layer.