In this paper the plasmic charactrization in discharge section has been investigated for the high power CO laser. Electron density, conductivity and equivalent resistance of the plasma have been calculated. From these the power injected into the discharge section is calculated as well. The calculatino result express that for the typical condition of laser operation electron density approximate 10 10 /cm 3, value of equivalent resistance within several hundred Ohm. The calculated value of equivalent resistance and injected power agrees basically with the value of measurment.