Abstract: The melting point of 6061 aluminum is close to the melting point of the off-the-shelf Al-Si-Cu-Mg filler metal and the brazing technology is hard to control. To solve this problem, the research of vacuum brazing 6061 aluminum with Al-Si-Cu-Mg filler metal is carried out. The proper vacuum brazing parameters of 6061 aluminum are obtained through reasonable experimental design of brazing parameters. Fractography analysis and corrosion resistance test are conducted for brazing samples. It is found that Cu elements in brazed joint is diffused in the interfacial region under proper control of brazing parameters, just a thimbleful of Cu elements form the solidification structure with Al elements. The result of neutral-salt-mist test indicates that a thimbleful of solidification structure of Al-Cu in the brazing seam has little influence on the corrosion resistance capability.