Abstract: The weldability of TiB₂ particle reinforced aluminum matrix was researched based on fiber laser welding on 4 mm thick plate. The TiB₂ particles distribution and morphology were studied separately through optical microscope and scanning electron microscope. The results showed that Al/TiB₂ composite presented well weldability. The TiB₂ particles in the weld seam distributed more homogeneously than that in base metal. The TiB₂ particle appeared to crack when the laser heat input was up to P = 4. 0 k W and v= 1 m/min,but the interface between TiB₂ and base metal was close and intact which did not affect the serving properties.