Under normal circumstances, triglyceride 2.99mmol/L is relatively high. Generally, triglyceride level should be controlled within 1.8mmol/L. Therefore, if triglyceride 2.99mmol/L is relatively serious, it is necessary to complete various examinations to clarify whether there are primary diseases and comorbidities. If there is no comorbidity of hypertriglyceridemia, it is necessary to carry out strict dietary control, such as reducing the intake of fats and oils, low-salt diet, increasing the intake of fresh vegetables and fruits, and strengthening the exercise, such as jogging, swimming and so on. On the basis of diet and exercise control, triglycerides are not improved, then also need to be treated with medication, such as taking benzafibrate, fenofibrate, etc., the above drugs need to be taken under the guidance of a professional doctor. If triglyceride 2.99mmol/L and other underlying diseases, such as cardiovascular and cerebrovascular disease, then the treatment of the underlying diseases on the basis of lipid-lowering diet and exercise therapy, as well as drug therapy. Specific diagnosis and treatment should follow the doctor’s advice.