The effect of surface roughness on the discharge characteristics of surface dielectric barrier was investigated to optimize the plasma parameter via the dielectric surface condition. Quartz glass

as a dielectric barrier

was treated by abrading

and its surface roughness（Ra）was measured. The results show that the dielectric with Ra=427.1 nm gets the lowest initial discharge voltage

the highest average discharge power and the highest electron excitation temperature if the discharge excited low-temperature plasma evenly distributes in discharge gap. Change of abrading degree of dielectric surface significantly facilitates the parameter variation of the plasma excited by surface dielectric barrier discharge.