Taiji diagram is a circular pattern composed of black and white fish-shaped patterns, commonly known as yin-yang fish. Taiji is an ancient philosophical term in China, which means to deduce the origin of everything. Taiji diagram vividly expresses the philosophical thought that the alternation of yin and yang is the root of all things.

Taiji figures show a kind of mutual transformation and relatively unified formal beauty. It later developed into a unique "beautiful" structure in China national patterns. Such as "Welcome", "Harmony between husband and wife" and "Dragon and Phoenix are auspicious", all of which are vivid and beautiful auspicious patterns with one up and one down, one positive and one negative, and are deeply loved by the people.