The main vital purpose of gas generator (GG) solid propellant (SP) is, the burning of SP to produce the required gas amount with low temperature and without solid precipitate. Numerous variety of propellants and configurations have been used to create hot gas. A comprehensive study of several important aspects of SPGG design has been investigated in the present work. End burning mechanism, GG solid propellant types, various burning surface configurations, simplified design procedure, insulation evaluation, analysis of experimental works, numerical models have been developed to describe pressure variation with time and performance parameters. Effect of design parameters were also discussed. Good agreement is obtained between experimental firing data and the established models for SPGG parameters performance. Finally; the several design parameters of the SPGG are analyzed and investigated, each design parameter is treated separately while the other parameters are assumed constant.