The normal range of blood pressure in men should be less than or equal to 120 mmHg systolic and less than or equal to 90 mmHg diastolic. according to our hypertension guidelines, hypertension is defined as systolic blood pressure greater than or equal to 140 mmHg and diastolic blood pressure greater than or equal to 90 mmHg when measured three times on non-same day (generally two weeks apart). Because human blood pressure fluctuates 24 hours a day, it is also necessary to pay close attention to the dynamic changes in your blood pressure. In order to prevent hypertension, you can start from the following points: 1, control weight, control BMI under 24kg per square meter. 2, reasonable diet, low salt and low fat, limit sodium intake less than 6 grams per day. 3, quit smoking and limit alcohol. 4, keep a happy mood. 5, appropriate participation in sports and exercise.