An improved simple phenomenological theory of the optogalvanio effect in the hollow cathode lamp exciting by a pulsed laser is presented. A set of equations was obtained based on the population of the atomic levels and the rate equation of the electron density change and considering the electron movement in the discharge tube and the current circuit equation. The dependence of optogalvanic signal on current and pressure of buffer gas and laser intensity and its temporal behavior are predicted by those equations. According to this theory^ it is possible to measure the same plasma parameters in low pressure gas by using pulse optogalvanic effect.