The characteristics of hypertension in the elderly ① 60-70% of hypertension is purely systolic; ② purely systolic hypertension can increase the death rate and the incidence of cardiovascular disease by 2-4 times; ③ there are a variety of cardiovascular risk factors, target organ damage and related cardiovascular disease, the selection of antihypertensive agents is more complicated; ④ blood pressure fluctuations, prone to postural hypotension, especially when the antihypertensive treatment and emotional changes occur; ⑤ (5) prone to cardiovascular disease and cardiac insufficiency; (6) increased pulse pressure, the risk of systolic blood pressure increase is much greater than diastolic blood pressure increase, and most patients systolic blood pressure is more difficult to control than diastolic blood pressure; (7) common blood pressure circadian rhythm abnormalities; (8) most have low renin, low sympathetic activity and high volume, high beat volume characteristics, so diuretics and calcium antagonists for the treatment of hypertension in the elderly than other types of antihypertensive effect.