Nanometer ceramic SiC powders have been synthesized by laser-induced Diethoxydimethylsilane. The process of the formation of the powders was studied. The powders produced were examined and characterized by various methods. At the same time, the crystallization behavior of the laser-synthesised nano amorphous SiC has been studied primarily. The results showed that the reaction temperature could be controlled by controlling the reactant flow rate, and the powders composition and structure could also be controlled. When the other conditions were fixed and the reactant vapor flow rates were 700～820 sccm, the ideal amorphous SiC nano-powders were produced. It was found that the initial crystallization temperature of the amorphous nano SiC powders was 1160℃and β-SiC could be obtained from the solid reaction of amorphous SiC.