Commonly used methods to improve blood viscosity include improving diet, lifestyle and medication. Treatment should be chosen according to the specific condition, and there is no such thing as the “fastest” method. 1. If the blood viscosity is mild and there is no underlying disease, you can improve the blood viscosity gradually by improving the diet, such as low-salt, low-sugar and low-fat diet, increasing vegetables and fruits rich in vitamins and microelements, drinking more water and increasing the blood volume. 2. If the blood viscosity is caused by obesity or long-term alcoholism or smoking, we can quit smoking, alcoholism and weight reduction to improve the blood viscosity. 3. If blood viscosity is accompanied by diabetes and high blood pressure, it can be treated by adjusting blood pressure and controlling blood sugar. This will improve the condition of blood viscosity. 4. If blood viscosity is accompanied by high blood fat, oral lipid-lowering drugs such as atorvastatin, resuvastatin, etc., with the lowering of blood fat, the condition of blood viscosity will also be improved. There may be other ways to improve blood viscosity, it is recommended to go to the hospital in a timely manner, under the guidance of a doctor to standardize the treatment. The above medications should be used under the guidance of a doctor and avoid self-medication.