Epoxy resins are considered as one of the most important classes of thermosetting polymers for many industrial applications, but unfortunately they are characterized by a relatively low toughness. In this work, oligomer of epoxidized linseed oil (OELO) was used as a modifier for epoxy polymer. Different contents of OELO are evaluated for effecting on the most of mechanical properties of the epoxh resin. The fracture toughness of epoxy resin significantlyincreased by 64.4 percent from 1.46 MPa./m2 to 2.40 MPa./m2 just by adding 6 phr (part per hundred of resin) OELO. Impact strength, cupping and scratch properties of polymer films significantly increased 96.4 era, 115 percent and 260 percent, respectively with content 10 phr OELO in compositions.