Abstract: The paper analyzes the sensitivity of two unit system for system parameters uses Regenerative Point Graphical Technique (RPGT). Taking failure and repair rates constant. A state diagram of the system depicting the transition rates is drawn. Expressions for path probabilities mean sojourn times, mean time to system failure, availability of the system, busy period of the server, expected number of server’s visits are derived using RPGT. Sensitive analysis of the system is done. Tables and graphs are prepared to compare and draw the conclusion.