Abstract: In order to solve the problem of the low welded joint properties by the traditional welding of low carbon steel SPCC/aluminum alloy A5052 dissimilar metals, laser roll welding of dissimilar metals of low carbon steel to aluminum alloy A5052 was performed based on 3 kW diode laser robot welding system, and the proper welding parameters were obtained. The characteristics of intermetallic compounds(IMC) at the interface layer were investigated by laser microscope, electron probe micro-analyzer(EPMA). The properties of the joint such as hardness and tensile strength were tested. The results showed that the IMC in the interface layer consists of ductile IMC(including Fe₃Al and FeAl) and brittle IMC(including FeAl₃, FeAl₂, Fe₂Al₅). The thickness of IMC was about 8-10μm. the highest strength of about 210 MPa was reached, while the thickness of ductile interface laye was nealy about 1.8μm.