In this paper, we proposed an improved antialiasing method for graphics hardware. We first give a detail introduction for the edge antialiasing methods which are popular now. Then, an improved edge antialiasing method is proposed. The basic idea of this method is that we employ five scanlines to scan all the sampling occurently. Thus, every three samples will be formed into a final sample and be stored into a unused storage space. Actually, this method is feasible to be implemented by hardware since it is low-cost. Experimental results show that our method can achieve good appearance.