Cai Yuanding, also named Cai Xishan, was a great Confucian scholar in the Southern Song dynasty, and his book, Mai jing (Pulse Classic), was long lost in China. According to Dai Qizong's Mai jue kan wu ji jie (Collected Annotations of Correcting Errors in Pulse Study in Verse) of the Yuan dynasty, Liu Yude's Yi lin xu chuan (Extending Biography of Medicine) of the Ming dynasty etc., the author makes a study on "Pulse Classic", the fourth volume of Zhen mai xu zhi (Notice of Pulse Taking), a book came back from the Cabinet Library of Japan and holds that it was an extract edition of Cai's Pulse Classic. When discussing the pulse, Cai paid attention to the theory of pulse while neglected the pulse conditions and its indications, which was further researched by the author.