LDL should be ≤3.4mmol/L for low-risk individuals in their seventies; <2.6mmol/L for high-risk individuals; and <1.8mmol/L for very high-risk individuals. Increased levels of LDL are closely related to the development of atherosclerotic cardiovascular diseases such as coronary heart disease and cerebral infarction, etc. LDL levels are categorized into four grades: low-risk, intermediate-risk, high-risk, and very high-risk according to the risk factors they possess. The extremely high-risk group is those who have been diagnosed with atherosclerotic cardiovascular disease, and their LDL cholesterol should be <1.8mmol/L. The high-risk group is those who have been diagnosed with hypertension. High-risk individuals have three risk factors on top of hypertension, such as smoking, BMI greater than or equal to 28 kg/m², systolic blood pressure ≥160 mmHg and/or diastolic blood pressure ≥120 mmHg; hypertensive patients with LDL cholesterol ≥2.6 mmol/L with two risk factors; or diabetic patients with LDL cholesterol ≥1.8 mmol/L and age ≥ 40 years of age. The ideal level for these groups is <2.6 mmol/L. All but the above groups are at low to intermediate risk, with a LDL ≤3.4 mmol/L. In conclusion, it is recommended to seek medical attention as soon as necessary for standardized evaluation and treatment as prescribed by the physician.