Chunyu Yi's achievements in pulse diagnosis are outstanding. According to Records of the Historian, it was first put forward and practiced by Bian Que in the Warring States Period that Chinese medicine used pulse diagnosis in clinic. Early pulse diagnosis is a "three-part and nine-wait" method, that is, the patient's head and neck, upper limbs and lower limbs should be diagnosed by feeling the pulse, which is inconvenient in practical application. In view of this, Chunyu Yi has carried out some reforms after long-term practice and exploration. He was feeling his pulse. Only the pulse cutting method of "Cunkou" is used, that is, only the artery of the wrist of the upper limb is cut. Of the 25 medical records he recorded, 2 had pulse records, which showed that pulse diagnosis played an important role in his diagnosis. "Cunkou" pulse was also called "air port" at that time, which was a simple and effective diagnosis method of pulse-cutting, and this method has been used all the time. Chunyu Yi recorded the contents of pulse diagnosis in depth and in detail. He thinks that the state of the internal organs of the human body can be reflected from the pulse-taking, for example, there are "heart pulse", "liver pulse" and "kidney pulse" in the diagnosis book, and there is also a case that "the pulse has no five zang-organs qi", which is a record of judging the health state of the internal organs of the human body by pulse diagnosis. This method of judging the health of zang-fu organs through cunkou pulse, although the diagnosis book is not a monograph on pulse diagnosis, so it is not recorded comprehensively and carefully, but Chunyu Yi did diagnose visceral diseases in this way. For example, his diagnosis book contains "the heart pulse is turbid and impetuous", "the liver pulse is string" and "the kidney pulse dominates turbidity", which shows that he can judge the symptoms of internal organs from the pulse condition. This can be said to be the first time for Chinese medicine to treat visceral diseases by inch-mouth pulse.