In this study, mechanochemcical process(MCP) is applied to synthesize ultrafine TaC powders. In this research, nano powder composite TaC-TaB2 was produced using mixtures of tantalum carbide and boron carbide as raw materials via mechanochemical process. The phase characterization during process and after sintering was utilized by X-ray diffractometry (XRD). The morphology of synthesized powder and SPS samples were studied by using scanning electron microscopy (SEM) and field emission scanning electron microscopy techniqes.TaC-TaB2 composite powder has been synthesised by a low temperature solid-state reaction between tantalum carbide and boron carbide. Studies show that by milling of powders TaC and B4C, TaB2 phase and the resulting composite TaC-TaB2 is composed. Prolonging the milling time up to 12 h resulted in a decrease of grain size to nano scale along with increasing strain and a slight increase in lattice parameter of TaC phase. Using fine tantalum carbide/boride composite (TaC-TaB2) powder, monolithic TaC-TaB2 ceramics with a relative density of 85% was obtained by spark plasma sintering(SPS)at 1900˚C. It is considered that the small particle size of TaC-TaB2 powder is important factor for preparing dense TaC-TaB2 ceramics with fine microstructure.