Premature beat,also called premature systole,is one of the most common arrhythmias,belonging to the Chinese medicine palpitations category.Professor LI Yufeng has valuable clinical experience on premature beat based on many years of experience.He believed that the basic pathological changes of arrhythmia is imbalance of Yin and Yang.The treatment method is to regulate yin and yang,and the effects of Guizhi Gancao Longgu Muli Decoction and Tianwang Buxin Pills are significant.