The wear properties of Bis·EGMA-Tri·EEDMA based composite resins to an Ag-Pd-Cu-Au alloy examined, using a trial sliding frictional wear testing machine, and the effects of water in a specimen on wearing characteristics were discussed. The water absorbed into the specimens softened the surface of the material and decreased the wear-resistant properties of them. On the other hand, the increase of Bis·EGMA content improved slightly the wear characteristics. In the range of 60-76wt% filler content, the wear of experimental composite resin decreased according to increase of filler content. In the case of 50wt% filler content resins, however, the wear of experimental composite resins was significantly less than in the o ther cases. There was high negative correlation between wear rate and Vicker's hardness of experimental composite resins (r=-0.84). In addition, there was high correlation between wear rate and amout of absorbed water in the specimens of76wt% filler (r=0.92).