Abstract: The knowledge of load bearing characteristics and failure of material is very important for mechanical engineers. Various metallic, non metallic and composite materials are used in different application. In view of this, the main objective of the present work is to analyze the influence of Aluminum Oxide filler on Fracture Toughness properties of Chopped Strand Mat (CSM) E-Glass Fiber reinforced Epoxy Resin Matrix Composites was evaluated using a Compact Tension (CT) specimen according to ASTM D5045 standard. Fracture toughness was conducted at six different compositions of composites. Three samples have to be tested for each composition of the composites.