The present work revolves around the investigations carried out on Fiber surface Treated Chopped Strand Mat (CSM) E-Glass fiber reinforced Epoxy matrix composites. Hand lay-up technique was used to fabricate the Epoxy based polymer matrix Composites reinforced with treated CSM E-glass fiber with a volume fraction of 3.42%. The three types of treatments were done on Chopped strand mat E-Glass fibers, namely no surface treatment, Heat treatment and Ethyl Silicate coating on heat treated E-glass fibers were used to evaluate the mechanical properties of the epoxy composites. The composites were subjected to mechanical tests preferably to determine tensile, flexural and Impact strengths. The test results showed that there has been a marked improvement in the mechanical properties of composites reinforced with fiber surface treated CSM E-Glass Fibers. E-Glass Fibers treated with Ethyl Silicate shows remarkable improvement in mechanical properties. Experimental results of mechanical properties for different surface treatment of E-glass fiber were evaluated and compared to conclude.