Epicardial adipose tissue (EAT) is a fat reservoir close to the myocardium and visceral pericardium. It has special anatomical and physiological characteristics. The volume and deposition site of EAT are closely related to the occurrence and development of atrial fibrillation (AF). This article discusses the connotation of the traditional Chinese medicine theory," yang transforming qi and yin shaping up the body",and holds that the essence of abnormal accumulation of EAT is "yang transforming qi deficiency and yin constituting form too much". Yin pathogen gradually accumulates,local yin and yang imbalance occurs,and abnormal secretion occurs. With the extension of time,the intrinsic yang heat is accompanied and becomes increasingly exuberant. Finally,yin is difficult to control yang,resulting in EAT infiltrating normal tissues,inducing and promoting the occurrence and progression of AF. Under the guidance of this theory,when distinguishing the amount of yin and yang between the body and EAT,considering the ability of "yang transforming qi" and "yin constituting form" in the whole and part,the method of supporting yang and eliminating yin should be reasonably selected. At the beginning of the disease,it is mainly to restore "yang transforming qi". By avoiding the accumulation of evil from the yin,it dissipates the body of the yin that has become. When the disease progresses,it is necessary to " eliminate pathogenic factor",supplemented by different treatment methods such as eliminating dampness,activating qi,and promoting blood circulation. Furthermore,the whole course of the disease should take care of the patient's deficiency,pay attention to strengthening yang and tonifying the healthy qi,and eliminate yin and evil promptly to improve clinical efficacy.