A large bore copper vapor laser with a 6.5 cm bore and 220 cm long discharge tube has been developed in this laboratory. A maximum output power of 106 W was achieved. The laser operated at a repetition rate of 5 kHz at the 510.6 nm and 578.2 nm lines of atomic copper. The efficiency reached 1% when the laser operated at the average output power of 95￣100 W. Some relations between output power and discharge parameters are prestented in this paper. An explanation of the physical characteristics of the large-bore CVL through a comparison of the large-bore CVL to the small-bore CVL is given.