Coronary slow flow(CSF) is a phenomenon with recurrent angina pectoris，which coronary angiography shows no significant stenosis in the coronary arteries(degree of stenosis≤40%)，but the phenomenon of delayed blood flow in the distal coronary artery.Western medicine currently has no definite therapeutic measures，and traditional Chinese medicine has unique advantages in improving CSF.Studies have found that Shexiang Tongxin Dripping Pills can improve coronary microcirculation，regulate endothelial cell function，improve inflammatory cell function，reduce leukocyte adhesion and anti-atherosclerosis，thereby reducing myocardial hypoxia，increasing coronary blood flow，and improving CSF.In addition，Shexiang Tongxin Dripping Pills show different immediate and long-term effects in different ways and dosages.