Abstract: Lead oxide was used as additive in coking coal to investigate homogeneous desulfurization behavior during coking process. Result shows that in plastic stage, lead oxide additive was sulfided and the release of sulfur in coal was suppressed. The amount of sulfur absorbed by lead oxide increased with the increase of added amount of lead oxide, however, this tendency almost disappeared when the additive amount reaches 0.6% of coal. In contract stage, lead sulfide decomposed under hydrogen-rich atmosphere and some elemental lead vaporized. Homogenous reaction between hydrogen sulfide and elemental lead vapor removes hydrogen sulfide efficiently as the hot coal gas left the carbonizer. Elemental analysis on the coke product shows that more than 50% of lead in coke could be removed. It's suggested that lead oxide additive could remove hydrogen sulfide homogeneously during coking process and is little deleterious on coke quality.