LDL should be less than 1.8 mmol/L after coronary stenting. Existing studies have shown that LDL levels are closely related to the development of atherosclerotic diseases such as coronary heart disease and cerebral infarction, so LDL levels should be strictly controlled. Therefore, LDL level should be strictly controlled, especially for patients with coronary artery disease who have already had coronary stents inserted. More should be strictly control its level, the current general requirements at least to be lower than 1.8mmol / L, or even maintain a lower level, conducive to plaque stabilization and even the reversal of the lesion. At present, patients are often required to take statins such as atorvastatin for intensive lipid-lowering on the basis of lifestyle intervention, and may also be considered to receive PCSK9 inhibitor iloyuzumab injection. It is recommended to seek timely medical treatment when necessary.