The effect ofnanoclay on some properties of epoxy resin DER 331 was studied. The results showed that contents of nanoclay up to 8 phr do not effect on curing level of resin. With nanoclay content of 2 phr, the properties of epoxy resin have been improved. The properties of resin as tensile, flexural, compressive, and impact strengths, swear resistance are increased as 30 percent, 50-70 percent, 40 percent and 60-70 percent respectively. However, the properties of epoxy resin are decreased with increasing nanoclay (above 3-5 phr) than that of original resin.