Abstract: According to design optimum and theoretical analysis of the CO2 laser,the techniques of the magnetically confined exciting,the transverse flow in two normal axes and multifolded cavity are employed.The transverse distribution of gain region and gain coefficient are analyzed and measured by means of amplification method.The results show that the gain coefficient of the laser is larger and the gain region is wider than ordinary transverse flow CO2 laser and the laser has the excellent TEM00 output mode with the multifolded cavity.