Jeongji(情志) in Chinese medicine refers to a series of psychological activity which is expressed as hui(喜), no(怒), wu(優), sa(思), bi(悲), gong(恐), gyeong(驚), together with emotion, sentiment, and cognition, which are manifested as responses of the human body to environmental changes both inside and outside. Sa(思) is a major cognitive activity, and the other six emotions are main emotional activities. The emphasis on the interrelationship between cognition, sentiment, and emotional activity is a unique characteristic of the Jeongji(情志) concept in China. Jeongji[Mental] disorder refers to a series of diseases that has a close link between the attack, clinical presentation and emotional stimulation. The attack is deeply affected by emotional stimulation, with which physical symptoms are either present or absent. However, emotional changes are clear most of the time, their effect on disease development noticeable as well. To sum up, Jeongji[Mental] disorder is related to a wide range of medical problems in fields such as internal, surgical, gynecology, pediatrics, and various psychiatric disorders, not to mention contemporary psychological disorders, neurosis, and all kinds of mental illnesses of today. Moreover, the mental and physical disorders of today all share a common pathogenesis, clinical manifestation and treatment discipline. All the more reason for deeper professional research.