Abstract: Si and C powders are used to synthesize SiC ceramic by SHS (Self-propagating High-temperature Synthesis) Process. Not only the influence of synthesis temperature on the morphology and constituent of the resultant, but also the effect of additive Ni on the Synthesis temperature have been studied in this paper. The results show that the synthesis temperature of the SiC ceramic is between 15000℃ and 1600℃, and the synthesis temperature can ha obviously decreased by adding Ni powder as an additive into the reactant.