In recent years, silica filled rubber has been used as tire tread rubber because of its low rolling resistance property. The purpose of this study is to clarify the effect of silica filler on the wear properties of rubber for tire tread. The experiments were carried out using six types of styrene butadiene rubber blended with butadiene rubber having different contents of silica filler ranging from 0 to 70 phr. The rubber specimen was rubbed against the metal gauze under oil lubrication. As a result, it was found that the more the specimen contained silica filler, the smaller the specific wear rate and coefficient of friction were. The worn rubber surface was observed by scanning electron microscope so as to understand the relation between the wear and abrasion pattern. The crack propagation underneath the ridge of abrasion pattern were calculated using both of the spacing of each ridge and the angle of inclined slope. It was found that the crack propagation rate decreased with increasing in the silica content.