The rolling treatment of steel/mushy Al 20Sn bonding plate was conducted under different relative reduction at room temperature. The effect of room temperature rolling on interfacial mechanical property of bonding plate was studied. The results show that, for steel/mushy Al 20Sn bonding plate which consists of 1.2mm thick 08Al steel plate and 2.0mm thick Al 20Sn layer, the relationship between interfacial shear strength and relative reduction is S=70.1+5.48r-r 2 (S is interfacial shear strength, r is relative reduction). When the relative reduction is 2.74%, the largest interfacial shear strength 77.6 MPa can be obtained. The results of that steel, mushy Al 20Sn bonding plate was conducted under different relative reduction at room temperature. The effect of room temperature rolling on interfacial mechanical property of bonding plate was studied. The results show that, for steel / mushy Al 20Sn bonding plate which consists of 1.2 mm thick 08Al steel plate and 2.0 mm thick Al 20Sn layer, the relationship between interfacial shear strength and relative reduction is S = 70.1 + 5.48rr 2 (S is interfacial shear strength, r is relative reduction). When the relative The reduction is 2.74%, the largest interfacial shear strength 77.6 MPa can be obtained.