This graduate project work focuses on the study of the superconducting properties of high temperature H2S under high pressure and a background of this study was also discussed. This compound was found to undergo a transition from a normal state to a superconducting state at a transition temperature of about TC =203 K. We made a detailed review on H2S and plotted phase diagrams which demonstrate the variation of upper critical magnetic field with temperature, variations of lower critical magnetic field (HC1) with pressure, variations of Debye temperature with pressures, variation of critical temperature with the Debye temperature and are discussed accordingly. The phase diagrams show the direct relationship between pressure and temperature (T), critical magnetic field and critical temperature are the main parameters of solid H2S superconductor. Critical magnetic field of solid H2S is influenced by high pressure. At high pressure HC increases because high pressure decreases interatomic distance. To the best of our knowledge, we believe that the effect of pressure on superconducting H2S is reviewed adequately.