The laser output power of TEMoo mode from DC excition slow-flow CO2 laser made of ceramic tubes is 1.45 times higher as that of the laser made of glade of glass tubes. The experimental results are better than the distributed oaated Au film catalyst used for improving output property of DC exciting slow-flow CO2 laser by Mr. J. Maoken. The mechanism of output power enhancement of the ceramic CO2 laser was discussed.