The increase in blood flow resistance is mainly influenced by the viscosity of blood. It is known from Poiseuille’s law that the resistance to blood flow is proportional to the viscosity of blood. Any factor that increases blood viscosity may increase peripheral resistance, increase blood pressure, and increase the burden on the heart. It is possible to reduce blood resistance by taking appropriate medications and foods that lower blood pressure. How to prevent the increase of blood flow resistance? 1, drink more water: drink water to pay attention to the timing, such as in the morning before getting up, before each meal (1 hour) and before going to bed. It is best to have no less than 2000 ml per day. 2, a reasonable diet: less animal offal and animal fat, less fried food, dinner should not eat more meat and thick food, less sweet food. It is appropriate to eat light food, mainly vegetarian, coarse and fine grains with. 3, adhere to exercise: such as walking, jogging, playing tai chi, badminton, climbing, swimming, etc., can promote blood circulation. 4, medication: under the guidance of doctors, use some anticoagulation, reduce blood viscosity drugs, commonly used beneficial heart ketone, sodium alginate, enteric aspirin, theophyllin, streptokinase, pit viper antithrombin, etc.; can also use some blood activation drugs such as compound danshin tablets, angelica tablets, gynostemma, Chuanxiong, dipyridamole (Pansentin), etc. 5, no smoking: affect the blood circulation, reduce blood flow, reduce blood flow rate, which can lead to adverse outcomes. 6.Regular physical examination: People over 50 years old should have blood rheology examination and platelet aggregation test. According to the examination results, take effective protective measures to reduce the occurrence of embolic diseases. At the same time, the blood viscosity index can be dynamically observed to be aware of the situation.