Abstract--Two-dimensional periodic patterns have tbund a lot of applications in the industrial arts, textiles, advertisements etc. A periodic pattern graphics processing method has been proposed based on the basic pattern element (BPE) in the paper. Because of the changes of the topological properties of the BPE, the existing concept and the algorithms cannot be used directly. Therefore. the properties of the BPE will be discussed, and the new concept and algorilhms tbr the BPE processing wilt be proposed. The method presented has been used successfully in a jacquard fabric CAD systcm.