Abstract: The interfacial shear property of steel-aluminum solid to liquid immersing bonding plate after being rolled was studied and the relationship between interfacial shear strength and relative reduction was determined.The result proved that:for the bonding plate made up with 1.2mm-thick 08Al steel plate and 1.0 mm-thick aluminum layer, when the relative reduction was 2.73%,the interfacial subsidiary stress could be eliminated and thus the maximum interfacial shear strength 83.5MPa was obtained.