The criteria for the diagnosis of hypotensive shock are usually in the clinic, if the patient’s systolic blood pressure is less than 90 mmHg and diastolic blood pressure is less than 60 mmHg, the state of shock can be diagnosed. The causes of shock are different, some are cardiogenic, some are allergy-induced vasodilatation, and some can also be caused by severe infections leading to vasodilatation resulting in shock. However, before diagnosing shock, it is important to exclude a proportion of patients from the healthy population, such as young, thin women, who can normally have low blood pressure. A part of the patients with aortitis manifestations, arterial stenosis on both sides of the blood pressure can be lower than 90/60mmHg, this group of people can not be based solely on blood pressure diagnosis of hypotensive shock. If hypertensive patients, the blood pressure drop is greater than 40mmHg or more should also be considered as a state of shock, and can not be based solely on whether the blood pressure drops to 90mmHg and diastolic pressure of 60mmHg, to determine whether the state of shock.