2. Overview The Illustration of Difficult Classics is a publication jointly published by Chinese medicine. Volume 13. It is a bound volume of Illustrated Eighty-one Difficult Classics (8 volumes, some of which are 4 volumes) and Illustrated Wang Shuhe Pulse Tactics (4 volumes, plus 1 volume ***5 volumes). Legend of Zhang Ming's poetry fairy. Zhang was a famous doctor in the Ming Dynasty (16th century), and he made in-depth research on difficult menstruation and pulse diagnosis. In view of the annotations of Lu Guang (Wu people in the Three Kingdoms) and Yang (a doctor in the Tang Dynasty) in the early period of Difficult Classics; Later, when Ding Song Deyong explained the classics, he added some illustrations to those classics whose meanings were unknown to the Olympics, which was the beginning of illustrating the classics. Later, Shou wrote "Difficult Justice" with several pictures. Zhang thinks illustrations can help readers understand the original text more vividly. "... so he compromised his opinion and paid attention to his own ideas and every detail. Every difficult picture is subtle and tortuous, and he knows it like the back of his hand. Then eighty-one is a rare invention, and eighty-one is a detailed drawing ... "(See Tang Zheng reading" Secretary "). Therefore, although the form of difficult illustrations began in the Song Dynasty, every illustration began with Zhang Shixian.