Abstract:AlSi7Mg alloys,due to its advantages of high specific strength,good corrosion resistance and excellent castability,are widely used in automobile manufacturing and other fields.But the coarse eutectic silicon is easy to form in the process of solidification molding,which seriously damages the mechanical properties of AlSi7Mg.Adding metal elements and rare earth elements can optimize α-Al matrix,refine eutectic silicon and improve its mechanical properties.Effect of Sr,Sb,Cu,Zr metals,rare earth elements as well as a variety of rare earth elements or metal and rare earth elements compound on microstructure and mechanical properties is reviewed.