Abstract: In order to investigate the effects of ceramic additives on the properties of Ti₃SiC₂ matrix composites, Ti₃SiC₂ material as well as SiC/Ti₃SiC₂, Al₂O₃/Ti₃SiC₂ and MgAl₂O₄/Ti₃SiC₂ composites whose ceramic additive contents were 30wt% were fabricated by reactived hot pressing sintering method firstly. Then, the mechanical properties and conductivities of the materials were tested, the oxidation resistance of Ti₃SiC₂ matrix composites was investigated in the temperature range of 1 373-1 773 K, and the phase compositions and microstructures of sintering samples were characterized. The results show that the main products of Ti₃SiC₂ after high temperature oxidation are TiO₂ and SiO₂. The oxidation layer can be divided into two layers of inner and outer, the inner layer consists by two-phase mixture of TiO₂ and SiO₂, and the outer layer is TiO₂. A large number of apparent pores exist in oxide layers and the structure is relatively loose, which leads to the poor oxidation resistance. Comparing with Al₂O₃/Ti₃SiC₂ and MgAl₂O₄/Ti₃SiC₂ composites, SiC/Ti₃SiC₂ composite has better oxidation resistance.