SiC particulate reinforced aluminium metal matrix composites SiCp/101Al were welded by electron beam welding with different welding parameters, and the structure and properties of welded joints were investigated. The mechanical properties of welded joints with different welding parameters were studied through tensile test. The microstructure of weld metal was analyzed with optical microscope and the morphology of joint fracture was observed by SEM. The interfacial structure of SiC-A1 was analyzed with TEM, and the phase constituent of welded joint was tested by XRD. The results show that the joint strength can be improved by decreasing the heat input power of electron beam when getting the penetration bead. Some pores appeared mainly near in the bond line, but porosity can be suppressed to a great extent by increasing welding speed or electron beam scanning. Moreover, the modification of welding is advantageous to improve the joint qualities.