-Even though high temperature materials are preferred for gas turbine blades and guide vanes, appropriate design of its cooling is imperative. Selection of cooling and its design is very intricate task. With extreme care, knowledge and sophisticated facilities required to perform them. This research investigates the cooling designs on gas turbine guide vane made-up of Rene -77. Both existing impingement cooling designs as well as an improved showerhead cooling design are investigated. The structural design and finite element analysis performed in Pro/E. The result shows that the improved design out performs.