According to previous statistics, the incidence of myocardial infarction and stroke in the elderly living in winter in a room with a temperature of only 4 degrees is several times higher than in a room with a temperature of 15 degrees. This is because the sympathetic stress response is caused in the cold environment, which increases blood pressure and blood viscosity, obstructs microcirculation, and reduces the effective blood supply to important organs. Some elderly people do not bother to use heating devices and try to solve the problem by wearing more clothes, but in fact the effect is not good, because the warmth of clothes alone cannot stop the stress response caused by cold air, so in the cold environment, drugs alone cannot effectively control blood pressure. If the elderly really do not have the conditions for heating, it is recommended to go outdoors every once in a while for moderate physical activity, and the body can release a blood pressure lowering substance when it moves, which can last 1-2 hours. Cold damage to the body is not only limited to humans, but also seen in animals, some people put mice in a 4-degree environment, with the extension of exposure time, the mice’s meninges appear bleeding spots, it can be seen that there is a limit to the adaptation of living organisms to the cold, the elderly poor regulation should be avoided in the cold environment sedentary. After increasing the room temperature, it was observed that the effectiveness of antihypertensive drugs would be improved, on the contrary if it is difficult to control blood pressure in a cold environment.