Hypertension in the elderly is characterized by increased systolic blood pressure, increased pulse pressure, blood pressure fluctuations, mostly postural hypotension, as follows: 1, postural hypotension refers to the blood pressure in the sitting position after measurement, within 3 minutes of standing when the systolic blood pressure is 20 mmHg smaller than when sitting, diastolic blood pressure is 10 mmHg smaller; 2, postprandial hypotension refers to the meal within two hours of systolic blood pressure than before the meal is more than 20 mmHg smaller or systolic blood pressure ≥100mmHg before meal, and systolic blood pressure <90mmHg after meal; 3, office hypertension means that when visiting a hospital, the blood pressure measured meets the diagnostic criteria of hypertension, that is, blood pressure ≥140/90mmHg, but the blood pressure measured at home is normal; 4, circadian rhythm changes occur, blood pressure is high during the day and may be low at night, or seasonal changes, such as spring and summer junction or autumn and winter junction season, blood pressure will be high; 5, the elderly hypertension appears to have more complications and some combined diseases; 6, the elderly are prone to misdiagnosis and underdiagnosis of hypertension, which includes secondary hypertension. Secondary hypertension is mainly caused by kidney disease or adrenal gland disease, more commonly pheochromocytoma or renal artery stenosis and other factors; 7, the emergence of occult hypertension, refers to the hospital visit when the blood pressure is not high, but at home when the blood pressure measurement systolic pressure > 135 mmHg, diastolic pressure > 80 mmHg; 8, the emergence of pseudohypertension, hypertension measured blood pressure belongs to hypertension, but actually monitor arterial blood pressure values are normal.