Whether a coronary artery with an 80% blockage needs to be treated with stent placement requires an assessment of the site of the blockage. Coronary artery disease atherosclerosis vessel stenosis degree more than 80%, especially the left anterior descending branch, the right coronary artery anterior descending branch, the right coronary artery gyratory branch occurs in the degree of stenosis more than 80%, need to be placed stents to carry on the treatment. In the case of 80% blockage of the coronary arteries, treatment without stenting may be considered, and collateral circulation may be formed. When stenting is not appropriate, treatment can also be performed with a balloon, which is usually coated with a drug that inhibits intimal hyperplasia while adhering to the vessel wall to inhibit intimal hyperplasia. Coronary artery bypass grafting can also be performed. It is recommended to consult the Department of Cardiovascular Medicine of a regular hospital to determine whether a stent needs to be placed if the stenosis of a coronary artery is more than 80%.