The terawatt picosecond CO<sub>2</sub>-laser design is considered in the paper. The CO<sub>2</sub>-laser system includes itself the
following units: a) master oscillator with variable pulse width of 100 ps, and b) laser pre-amplifier being developed on a
basis of a ring optical scheme and operating under the gas pressure of 3 atm. Both experimental and theoretical analysis
of the CO<sub>2</sub>-laser system is carried out.