Abstract: The studies were conducted by flash butting welding of SiC particle reinforced 3003 aluminium matrix composites. The welding process of SiC particle reinforced 3003 aluminium matrix composite can be conducted effectively and the joint of high quality can be gained under the appropriate flash butting welding parameters. The forming mechanism of the joint was studied by means of EDX unit and SEM. The distribution of SiC particles in the joint and interface reaction of SiC-Al were analyzed and discussed. The results show that the impurities of gas and solid state can be removed and the sound joint without gas hole, impurities and cracking can be gained by means of the burst of metal beam and the plastic deformation of joint interface in the flash butting welding process, and the joint possesses high strength owing to the SiC particle gathering in the joint zone.When the SiC-Al reacted, the harmful affection for the joint quality can be reduced because of low welding temperature and short welding time in the flash butting welding process.