The Al-Mg-Si/Cu-Cr-Zr bimetal composite was prepared by solid-liquid composite casting. The microstructures and properties of Al-Mg-Si/Cu-Cr-Zr bimetallic composites were characterized and analyzed. The results show that the aluminum alloy side of the bimetal composite is mainly composed of α-Al matrix and (Mg,Si) phase. The copper alloy side is mainly composed of copper matrix and Cr rich phase. The interfacial transition layer of the bimetal composites is 5-10 μm thick and mainly composed of copper and aluminum elements. No obvious precipitates are found in the transition layer. The tensile strength of the bimetal composite increases with the increase of copper alloy side thickness. With the decrease of ambient temperature, the tensile strength of Al/Cu bimetal composites increases first and then decreases. When the ambient temperature is -30 ℃, the tensile strength of the bimetal composite is about 390 MPa.