Low blood pressure, also known as diastolic blood pressure, below 90mmHg is mild hypertension, which can be lowered by improving diet, adjusting lifestyle and taking antihypertensive drugs. 1. Improve diet: Normally, we should have a low-salt and low-fat diet, eat more vegetables and fruits, and avoid cholesterol-rich foods. Obese patients should control the amount of food and total calories, reduce weight, quit smoking and drinking, etc. can assist in lowering blood pressure. 2. Adjust the lifestyle: usually pay attention to the combination of work and rest, to ensure adequate sleep, avoid staying up late, pay attention to rest, you can play an auxiliary role in lowering blood pressure through appropriate exercise. 3. Taking antihypertensive drugs: If the blood pressure does not decrease through long time observation, it can be treated by taking beta-blockers, such as metoprolol, bisoprolol and other drugs under the guidance of doctor. If the patient’s blood pressure rises for a long time or persistently, he should go to the hospital in time and cooperate with the doctor for treatment.