Height and weight standards, the clinical most of the body mass index formula calculation. Body mass index (BMI) = weight/height ² (kg / m²), the normal range of 18.5 ~ 24, according to this formula can be calculated height 170cm, weight range of 53.5 ~ 69 kg are normal. However, it should be noted that the calculation of appropriate weight by height is for reference only, and there may be errors in some special cases (e.g. muscular development, etc.). The “right” weight should also be measured in combination with waist circumference, waist/hip ratio, and subcutaneous fat or visceral fat calculated by CT or MRI. Exercise in moderation and avoidance of intensive high-calorie diets are conducive to the preservation of normal body weight. Maintaining a healthy body weight effectively reduces the risk of many diseases (hypertension, diabetes mellitus, cardiovascular and cerebrovascular diseases).