Abstract: In order to study the discharge and break down characteristics of CO2 laser with distributing of gold rings ,a comparison experiment has been carried out with CO2 laser tubes one was typical, the other was improved by putting a series of gold rings in the discharge capillary .Two kinds of gases helium and neon have been used in the experiment. The results showed that both the break down voltage and the terminal voltage of the laser tube with gold rings are increasing significantly in comparison with the tube without gold rings.