Elderly people with blood pressure of 40 to 50 mmHg need treatment, starting with rational management of the cause. Determine whether to take too much medication, shock, hypovolemia and so on. 1. Overdose of drugs: when the elderly use antihypertensive drugs overdose, it can lead to a significant drop in blood pressure, at this time, pay attention to regular monitoring of blood pressure, reduce the dose of drugs, or stop using antihypertensive drugs and pay attention to the monitoring of blood pressure. 2. Shock: When shock occurs, first of all, we should give positive treatment, such as cardiogenic shock can lead to a decline in the ejection capacity of the heart, then actively use drugs to raise blood pressure, clinically more choose dopamine. 3. Hypovolemia: when hypovolemia occurs, such as patients with severe nausea, vomiting, diarrhea, can lead to a decrease in blood pressure, in fact, need to be active infusion of fluids to elevate the blood pressure to carry out treatment. Elderly people with diastolic blood pressure of 40~50 mmHg are prone to insufficient cardio-cerebral perfusion, which induces cardio-cerebral and cerebrovascular adverse events, and it is recommended to actively carry out the treatment and consult the cardiovascular internal medicine department of regular hospitals.