TiB₂-TiC-Ti₃SiC₂ composites were reaction-sintered from B₄C-xSiC-(3+2x)Ti (x=0 to 1) powder mixtures using reactive hot pressing, and the phase relation of reaction products and sintering behavior were investigated. The reaction B₄C+xSiC+(3+2x)Ti→2TiB₂+(1−x)TiC+xTi₃SiC₂ proceeded fundamentally during hot pressing. Although the reaction demands no production of TiC phase at x=1, TiC phase was formed due to the nonstoichiometry of TiC and Ti₃SiC₂ phases produced. The hot-pressed composites containing the layered compound Ti₃SiC₂ had no preferential texture. Both TiB₂ and TiC were first produced near 960°C during heating, and then Ti₃SiC₂ near 1200°C. The product Ti₃SiC₂ contributed effectively to the densification of the composites above 1450°C.