The reasons why blood pressure does not come down are less types of antihypertensive drugs used, combined with kidney function damage, no improvement in lifestyle, secondary hypertension, as follows: 1, less types of antihypertensive drugs used: some people use a single antihypertensive drug, blood pressure may not come down, need to combine two or more antihypertensive drugs, blood pressure can come down to normal. 2, combined with kidney function damage: hypertension if combined with kidney function damage. Blood pressure will be more difficult to control, need to improve the kidney function test, to understand whether creatinine is elevated. 3, did not improve lifestyle: If lifestyle is not improved, such as still adhere to long-term drinking, smoking, staying up late, and eating too salty food, these will lead to poor control of blood pressure. 4, secondary hypertension: With secondary hypertension, the general use of antihypertensive drugs, blood pressure is difficult to control, such as Renal artery stenosis, pheochromocytoma, primary aldosteronism, etc., need to improve the renal artery ultrasound, adrenal CT, hypertension five items and other tests to clarify the diagnosis.