The utility model provides a research model which can intuitionally and more exactly reflect the relationship among taiji, yin, yang, the eight diagrams and the sixty-four diagrams and provides an intuitional and visual structure for widely lovers and researchers in relevant fields for knowing, understanding and studying the culture and the science connotation of, < Book of Changes >. The utility model comprises a cube-shaped eight-diagram mother body and eight cube-shaped sixty four-diagram son bodies which are arranged on eight top points of the mother body. In the utility model, each top point one-to-one corresponds to one son body; the mother body is orthogonally divided into eight secondary cubes and is provided with the eight diagrams of 'qian', 'dui', 'li', 'kun', 'gen', 'kan' and 'xun'; the eight son bodies are orthogonally divided likewise and are respectively provided with eight diagrams; the sixty-four diagrams derive from the eight diagrams of the mother body.