In the present work, steel leaf spring used in passenger cars is replaced with a composite leaf spring made of a glass/epoxy composite The primary objective is to compare fatigue characteristics of SAE1045-450-QT steel and E-Glass/Epoxy Composite material. Based on the available design data a fatigue analysis is carried out on an ANSYS Workbench v14. 0 and the results of the simulation are documented. Factors like fatigue life, fatigue damage, biaxiality indication, rain flow counting and fatigue response are plotted for the composite leaf spring and the fatigue performance is predicted using life data. Therefore the objective of this paper is to present a design and simulation study on the fatigue performance of a glass fibre/epoxy composite leaf spring through design and finite element method and prove the reliability of the validation methods based only on simulation, thereby saving time, material and production costs for a complete product realization.