The corrosion resistance of aluminum/steel joints brazed by ZnAl2,AlSi12 and AlSiNi filler metals were analyzed by means of SEM,EDS,electrochemical corrosion test,salt spray corrosion test and mechanical property test. Experiments show that the corrosion resistance from strong to weak are Q235 steel,3003 aluminum alloy,AlSiNi,AlSi12 and ZnAl2;brazing seam metal is more susceptible to corrosion. After 240 hours’ salt spray corrosion test,ZnAl2 joints’ tensile strength decreased by 92%,showed the worst corrosion-resistance;AlSiNi joints’ tensile strength decreased by 27%,showed the best corrosion-resistance,Ni element could effectively improve the corrosion resistance of Al Si filler metal. The corrosion in AlSiNi and AlSi12 brazing joints preferentially occured at the interface of steel and brazing seam,the α-Al phase was firstly corroded. The Zn phase in ZnAl2 brazing joints was firstly corroded.