Submicron TiC-TiB 2 composite powders were synthesized by carbo/borothermal reductions from a novel carbon coated TiO 2 precursors method. Reactants were also mechanically mixed for comparison. Precursors and conventionally mixed powders were reacted from 1100 to 1500°C for 2 hours in flowing argon at 1L/min. Phase evolution, thermodynamic analysis, microstructures, and surface areas were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and Brunauer-Emmett-Teller (BET) surface area analyzer, respectively. Products synthesized from precursors had high purity of TiC-TiB 2 mixture, fine particle size, narrow size distribution, regular shape, loose agglomeration, and high surface area. Powders with different compositions were also prepared by controlling the ratio between reactants. The sintering tests demonstrated that produced powders can be sintered to a 99.6% relative density using 5 wt. % nickel additives at 1550°C for 2 hours in flowing argon atmosphere.