The residual risk of remnant cholesterol (RC) has been highly valued by Europe and the United States recently. Compared with the traditional four blood lipids (low-density lipoprotein cholesterol, total cholesterol, triglyceride, high-density lipoprotein cholesterol), remnant cholesterol has a very important predictive value in various cardiovascular diseases such as atherosclerotic heart disease, in-stent restenosis, and aortic stenosis, and this predictive value is independent of the traditional four blood lipids. Attaching importance to and regulating remnant cholesterol levels is very necessary to improve the prognosis of cardiovascular disease.