The destructiveness of sulfide in its free hydrogen-sulfide form is distinguished to bring suffering to persons at its poorer concentration, while at its elevated concentration it may give a deficiency of consciousness, long-lasting brain damaging or even death through suffocation. In this study after preparing and characterizing Exfoliated graphite (EGt), functionalized graphite and Exfoliated graphite/chitosan, films have been prepared, and the cadmium ions were laden on it to be used in the detection of hydrogen sulfide gas electrochemically. The findings showed that a notable change in the electrical conductivity with a time of the films under investigation in response to gas adsorption. To determine the effect of the amount of EGt on the conductivity measurements at detection of H2S gas in darkness and light we used various weights to know which is better. Furthermore, to determine the effect of H2S gas concentration on the electrochemical conductivity of graphite (Gt) and EGt films, we passed different concentrations of gas every 15 minutes and measuring the electrical current. Furthermore, the graphite and Exfoliated graphite were examined by X-ray diffraction (XRD), and scanning electron microscopy (SEM).