The　strength　and　failure　mode　of　dissimilar　materials　joint　between　galvanized　low　carbon　steel　and　aluminum　alloy　made　by　cold　metal　transfer　(CMT)　welding　process　were　investigated.　In　order　to　enlarge　the　bonded　area　of　brazed　joint,　preset　gap　was　introduced　between　steel　and　aluminum　alloy　during　CMT　welding　processing　by　means　of　feeler.　It　is　found　that　the　shear　strength　of　steel/aluminum　CMT　welded　joint　could　be　improved　with　increasing　of　preset　gap　because　the　length　of　bonded　line　was　improved.　When　the　preset　gap　was　increased　to　0.5　mm,　brittle　fracture　occurred　at　the　interface　layer　between　steel　and　aluminum　due　to　the　existence　of　remained　zinc　at　the　weld　toe.