In order to develop a clean and direct production of acetylene, a H-2/Ar plasma jet is used to convert coal into acetylene. The efficiency of conversion depends oil such factors as the size range of the coal particle, the volatile matter in the coal, and the operating conditions. Experimental results with different coals indicate that volatile content plays an important but not exclusive part in acetylene generation. Higher input power and smaller coal article size are in favor of the formation of acetylene.