Coronary artery disease is one of the leading causes of human death. PercutaneousCoronaryInterventionPCI, developed in the last century, can improve coronary blood flow, reduce angina symptoms, improve patients’ quality of life and prolong life, while the procedure is less invasive and convenient, and has now become one of the most It is now one of the most effective treatments for patients with coronary artery disease. However, PCI has its limitations: 1) it is not suitable for patients with mild or moderate coronary artery lesions; 2) it is not suitable for patients with angina pectoris caused by myocardial ischemia due to dilated coronary arteries and slow blood flow; 3) patients with chronic and prolonged occlusion of coronary arteries that cannot be opened by PCI; 4) new coronary artery stenosis lesions may occur after PCI; 5) the problem of restenosis of vessels after PCI etc. EnhancedexternalcounterpulsationEECP is a special non-invasive mechanically assisted circulatory device, the mechanism of which is to use mechanical action to increase aortic root diastolic pressure, reduce aortic systolic pressure, increase coronary blood flow and improve myocardial metabolism. Studies have shown that EECP has the advantages of increasing coronary blood flow, improving blood flow shear stress, improving vascular endothelial cell structure and function, preventing thrombosis, and promoting the formation of vascular collateral circulation. Therefore, post-PCI patients can derive benefits from EECP beyond PCI. Our study showed significantly fewer clinical events in the EECP group after PCI than in the group without EECP after PCI: more patients without chest pain, less in the EECP group with chest pain, better cardiac function in the EECP group than in the non-EECP group, fewer rehospitalizations or PCI for angina, fewer recurrent myocardial infarctions, and less overall mortality. Some patients underwent coronary angiographic evaluation, and the results suggested that: 1. The incidence of restenosis did not change significantly between the two groups, but the diameter of the reference vessel segment was significantly larger in the EECP group than in the non-EECP group; 2. The coronary collateral circulation increased significantly in the EECP group; 3. For those with coronary artery dilatation and slow blood flow, EECP could improve their blood flow velocity. Therefore, EECP can further benefit patients after PCI and improve the prognosis of patients after PCI.