The classification of hypertension can be divided into two types: primary hypertension and secondary hypertension, of which primary hypertension accounts for more than 95%, mainly seen in men over 40 years old, mostly due to genetic predisposition. Primary hypertension can not be cured by any drugs, only by long-term treatment with antihypertensive drugs, low-salt diet, exercise. Secondary hypertension is mainly seen in: 1. renal hypertension, mainly due to hypertension caused by renal insufficiency, elevated creatinine is found in blood sampling and kidney function. 2. renal artery stenosis, especially severe stenosis of both renal arteries, can be clearly diagnosed through renal artery ultrasonography. 3. pheochromocytoma, mainly seen in paroxysmal increase in blood pressure, may be accompanied by hypokalemia, most of which can be detected through adrenal CT examination. 4, primary aldosteronism, mainly manifested as hypokalemia and long-term hypertension, can be found through blood tests, aldosterone increased, blood aldosterone, plasma renin activity ratio increased, the application of spironolactone antihypertensive effect, the treatment of hypertension need to be under the guidance of a doctor.