The article explores the meaning of the character "xing" in the ancient texts I Ching and Yi zhuan. It shows that "xing" primarily signifies way and walking, with additional meanings like behavior and practice. In Yi zhuan, "xing" expands to include concepts like virtuous behavior and heavenly motion, delving into metaphysical ideas. This reveals how Yi zhuan built upon the principles of I Ching, leading to a deeper understanding of the relationship between Yin and Yang.