From the experiment of a Non-Thermal Dielectric Barrier Discharge Generator using a DC power supply, it was found that adjusting value the gas flow rate increased the plasma is the longer. Increasing and reducing the gas flow rate be affect effective in the discharge voltage and current just slightly because of the plasma discharged around the end of the plastic tube. When the gas flow rate was inert, there was a breakdown in further distances and the length of plasma was longer. The change of the gas flow rate. As a result, voltage discharge and current discharge much less. Because the plasma causes discharge at the electrodes. When gas flows is very to make gas the breakdown on the point far more. Result in dose plasma is longer.