Abstract: Two design schemes, diaphragms discharge tube and CuBr hydrogenfilled laser discharge tube, were adopted in the engineering design in order to overcome the nonuniformity of radial temperature in the discharge tube of CuBr laser. The diaphragm structure and the temperature field of the hydrogenfilled CuBr laser discharge tube are analyzed. Based on the heat flow dissipation Poisson equation, a mathematical model of temperature field distribution in the laser discharge tube is set up, an analytic expression for the gas temperature field radial distribution in the laser discharge tube is derived. The relation between the temperature distribution and the input electric power thermal conductivity of the buffer gas is defined. The achieved result agrees with experiment result. A theoretical analysis is provided for the applications of such laser.