Results and configuration of a high-repetition-rate pulsed-discharge TEA CO2 laser with spark-pins ultraviolet preionization are described. The uniform glow discharges between two symmetrical Chang electrodes through an auto-preionization electrocircuit are controlled by a high-voltage pulsed trigger and a rotary spark-gap switch. The experimental dependence of single pulse output of laser emission as functions of pressure and proportion of gas mixture and of injected energy. The results indicate that the single pulse output and opto-electric conversion efficiency has an optimal point with the pressure of CO2 or pressure of N2 and this point can be changed with injected energy. The single pulse output and opto-electric keeps a linear relation with the gas pressure. In the situation of the single pulse mode, the laser can inject much energy and fill up high gas pressure comparing the repetition pulsed-discharge mode, simultaneously, the maximum pulsed output energy of 53J is obtained. The highest conversion efficiency reaches 17 % after further parameters optimization.