The effect of Al2O3 on the mechanical properties and microstructure of a Ti3SiC2/ Al2O3 composite fabricated by SPS(Spark Plasma Sintering)was studied in detail. The results show that the presence of the Al2O3 improves the hardness of the Ti3SiC2 up to 10.28 GPa. While at the same time increasing the strength and fracture toughness. On the other hand, slight decreases in flexural strength and fracture toughness were observed with Al2O3 additions higher than 10vol%, as a result of agglomeration of Al2O3 particles in the composite.