Abstract: According to the theory of dielectric barrier discharge, coal desulfurization experiment of dielectric barrier discharge was done. The experiment result showed that influence factors of coal desulfurization with dielectric barrier discharge are electrode structure, medium composition and air-gap distance, for example, desulfurization effect of putting medium on discharge board is better than the one of putting medium in air-gap, the intensity of microdischarge of adding coal is stronger than that the one of unadding coal; the desulfurization effect changes in “U” type, so it can be deduced that desulfurization has a best applied voltage in certain external conditions with dielectric barrier discharge; the phase scope of discharge pulse expands gradually with increase of the voltage.