Hypertensive crisis refers to hypertensive emergencies with significantly elevated blood pressure with target organ damage (e.g., hypertensive encephalopathy, myocardial infarction, unstable angina, pulmonary edema, eclampsia, stroke, fatal arterial hemorrhage, or aortic endothelial dissection) and hypertensive sub-emergencies with significantly elevated blood pressure but no target organ damage. The principles of treatment of hypertensive crisis facilitate individualized treatment of patients. 1. Master the magnitude and speed of blood pressure decline. Patients with chronic hypertension, whose blood pressure auto-regulation is impaired, will have insufficient blood supply to the heart, brain and kidney organs if they lower their blood pressure to normal within a short period of time; patients with malignant hypertension, whose small artery stenosis has led to insufficient local blood supply, will have increased organ ischemia if they further lower their blood pressure to normal or below. 2, the use of drugs refused to be uniform. Comprehensive patient clinical situation, the initial antihypertensive should follow the principle of choosing antihypertensive drugs from small doses. For elderly patients, the speed of lowering blood pressure should not be too fast. Due to the decreasing ability of blood pressure auto-regulation, and often combined with coronary heart disease, the speed of antihypertensive, easy to induce angina pectoris and other organ ischemia performance; for non-elderly patients, according to the individual response to antihypertensive drugs, gradually increase the dose as appropriate; for patients with experience in antihypertensive drugs, understanding the effect of their previous medication and adverse reactions can provide important therapeutic reference value for physicians. 3, the goal and pathway to lower blood pressure. When hypertensive emergencies appear, the blood pressure should be lowered to the target value within the best time for lowering blood pressure in different emergencies, generally to 20%-30% of the original arterial blood pressure first; the emergence of hypertensive sub-emergencies, although less life-threatening to patients, but sustained hypertension leads to impaired target organ function, usually using oral drugs to lower blood pressure, blood pressure should be gradually lowered in 24-48 hours to avoid the speed of lowering blood pressure too fast to cause patients The discomfort appears and the blood supply to the organs is insufficient.