Some new applications of the optogalvanic spectroscopy technique is proposed in present paper. Under fixed discharge condition, using the intra-cavity optogalvanio technique, the saturation parameters of CO laser medium and its dependence on the temperature and current have been measured. By measuring small-signal optogalvanic signal responsivity, the gain distribution and the ratio of the population of vibrational levels have been obtained and the resonance self-absorption of a few lines has been obtained and the resonance self-absorption of a few lines has been, observed. The method is simple and rapid, so it may be used for real-time measnromenl of some dynamic parameters in gas laser.