A GW level high power CO2 laser system has been developed. A short laser pulse is cut out by a double Pockels eellelectro-optical shutter from a hybrid CO2 laser oscillator and amplified by a three-stage dual-path TEA preamplifior, a two-stage TEA preamplifier, a large aperture TEA amplifier and an electron beam controlled terminal amplifior. All parts of the laser system are controlled with a control system. The laser output power is up to 3.2×l09 watts, and the laser pulse width is 4 ns.