In this study, we analyzed the desulfurization performance of Zn-based dry sorbents according to the reducing power, water vapor content and H2S inlet concentration of coal gas in a batch-type fluidized-bed reactor. We used three different coal gas composition with different reducing power such as KRW air-blown coal gas, Shell oxygenblown coal gas and IAE coal gas. The experiments were performed by changing the inlet concentration of water vapor and H2S in a coal gas. Water vapor content was varied from 5% to 30% and H2S inlet concentration from 0.5% to 2.0%. As both the water vapor content and H2S inlet concentration increased, desulfurization performance of Zn-based sorbents decreased regardless of the reducing power of the coal gas. The minimum desuflurization performance was, however, above 99.5% for all experimental conditions, which implied that Zn-based dry sorbents could be used to remove H2S up to 99%.