Low pressure normal high pressure refers to simple systolic hypertension, the incidence of which increases with age and is mainly caused by factors such as increased stiffness of the large arteries and reduced arterial elasticity. Quiet, awake, and without the use of antihypertensive drugs under the conditions of standard measurement methods, at least three times non-simultaneous measurement of blood pressure, systolic blood pressure ≥ 140 mmHg and 70 mmHg ≤ diastolic blood pressure < 90 mmHg, is called pure systolic hypertension. Simple systolic its hypertension is commonly seen in older adults over 60 years of age and is the most common form of hypertension in the elderly. The main causes include: 1, the increased incidence of atherosclerosis in the elderly, increased stiffness of the arteries is associated with aging, further leading to thickening of the arterial walls, narrowing of the lumen, and high blood pressure in the vessels further increases the stiffness of the arteries, resulting in a more pronounced increase in systolic pressure than diastolic pressure. 2, along with the ageing and the occurrence of reduced kidney function also makes blood pressure rise, with the increase of age, the decline of kidney function, the decrease of sodium excretion ability will lead to the increase of blood pressure. 3.Decrease in exercise in the elderly can increase the level of systolic blood pressure. 4.It is necessary to pay special attention to the reduced sensitivity of pressure receptors, elevated blood perfusion in the viscera after meals, and reduced sympathetic tone in the elderly, which can easily lead to significant changes in systolic blood pressure. At the same time, the higher the systolic pressure in the lying position and before meal, the more obvious the systolic pressure drop in the standing position and after meal, which can also be accompanied by dizziness, blurred vision, fainting and other related symptoms of low perfusion, resulting in adverse events that reduce the quality of life of the elderly. Low pressure normal high pressure high refers to simple systolic hypertension, the elderly are often dominated by simple systolic hypertension, in addition to pay attention to the control of hypertension, the elderly should also pay attention to the prevention of postural hypotension and other conditions.