The staging criteria for hypertensive patients are based on the complications of hypertension and the severity of the complications. Stage I hypertension is a condition in which only increased blood pressure is found, but there is no significant damage to the heart, brain, kidneys, or other organs. Stage II refers to the enlargement of the heart chambers, arterial spasm and stenosis of the fundus, or damage to kidney function and proteinuria. Stage III, hypertension grading criteria is more serious, mainly whether there is cerebral hemorrhage, hypertensive encephalopathy, coronary heart disease, angina pectoris, cerebral infarction and severe hypertensive heart disease, resulting in heart failure, hypertensive kidney damage resulting in renal failure, bleeding and exudation of the fundus. The staging of hypertensive patients can clarify the type of complications and the severity for specific treatment.