This paper introduces to the experiment results of a impact of the delay time changes between spark pin UV preionization and main discharge on the optoelectronic conversion efficiency in a TEA CO_2 laser. 介绍了TEACO2激光器火花针紫外预电离与主放电之间的延迟时间对激光器输出电光转换效率影响的实验研究结果。