Abstract: In order to reveal the degradation characteristics of CS_2in dielectric barrier discharge (DBD) reactors and improve its removal rate, coaxial cylinder-tube DBD reactors were designed to study the effect of several factors on removal rate of CS_2in DBD plasma. The factors include the number of dielectric layer, applied voltage, material and diameter of center electrode, type and relative humidity of background atmosphere. The experimental results showed that the removal rate of CS_2in the singer-dielectric-layer reactor was higher than that in the double-dielectric-layer reactor when the applied voltage was low (4.0-6.5kV). However, there was a higher removal rate of CS_2in the double-dielectric-layer reactor, when the applied voltage was higher (6.5-9.0kV). Higher applied voltage was helpful for the removal of CS₂. As a center electrode of the reactor, brass wire was superior to the stainless steel wire. The removal rate of CS₂can be improved from 63% to 75% by increasing the diameter of the center electrode, while the average energy consumption increased from 510kJ/mg to 611kJ/mg. Under the same conditions, the average removal rate of CS₂was the greatest in oxygen (74%), the second in the air (59%) and the smallest in nitrogen (48%). Appropriate relative humidity (26%) in the background atmosphere contributed to the improvement of the removal rate of CS₂, however, the high relative humidity (more than 50%) reduced the removal rate of CS₂.