By optimize the mixing conditions of powders and the conditions of the spark plasma sintering, dense 20 vol % TiB₂ particle aluminum composites with uniform distribution of particles were obtained. The thermal conductivity and the mechanical properties were estimated. The experimental results were good agreement with the theoretical value based on the rule of mixture which is considering the uniform distribution of particles and without pores. The strength of the composites at room temperature is lower than that of pure aluminum block, but the strength of the composites was improved at higher temperature such as at 100°C compared with the monolithic aluminum.