Compared to coal fly ash, much less research has been done on the reutilization of heavy oil fly ash(HOFA). In this study, as a program of reutilization in heavy oil fly ash, a possibility of reuse as a cement kiln auxiliary fuel was investigated through the analysis of physico-chemical characterization of heavy oil fly ash generated in power station. Average particle sizes of heavy oil fly ash varied from 24.7㎛ to 53.1㎛, and XRD data confirmed that it was mainly composed of amorphous carbon and contained V, Ni, Pb, Cu and As with variable amounts. The results of heavy metal analysis showed that arsenic contents of heavy oil fly ash is exceed to recycling standards as Cement Kiln Auxiliary Fuel in Korea.