Abstract: Ni/TiB₂-TiC composites were fabricated by spark plasma sintering using Ni, Ti and B₄C powder mixture as precursor. Effects of Ni content on phase composition, microstructure, microhardness and wear resistance of composites were analyzed. The results show that the mainly phases of Ni/TiB₂-TiC composites are γ-Ni, TiB₂ and TiC. TiB₂ phase presents rectangle strip and polygon shape, while TiC phase is irregular patch shape. With the increase of Ni content, the size of TiB₂ and TiC ceramics decrease gradually. Additionally, TiB₂ and TiC homogeneously disperse in the Ni binder phase, and the denser composites are obtained. Wear properties and mechanisms are influenced significantly by Ni content. When Ni content is low(20wt% and 30wt%), severe delaminate occurs with high and fluctuant coefficient of friction(COF). Micro-cutting wear appears with lower and smoother COF with the increase of Ni content(40wt%). However, when the Ni content continues to increase(50wt%), the adhesive wear results in poorer wear resisitance and higher COF due to the aggregation of Ni.