Abstract: The famous seal cutter WU Rang-zhi in late Qing Dynasty was the person who had inherited and developed the art school initiated by DENG Shi-ru, and got the essence the DENG’s Li calligraphy. His writing was skillful, structure was symmetric, strokes were fluent, and the ending was always protruding. And it was strongly dynamic. WU fulfilled the DENG’s thought of seal derived from calligraphy. And his seal cutting strikingly expressed his Li calligraphy, with stone as paper and knife as brush, and reached the fusion between knife and brush, and calligraphy and seal. And it made the calligraphy have more space in the little seal.