Diabetes, hyperlipidemia and hypertension may accelerate arteriosclerosis so as to cause terminal circulatory disturbance. The pressure value measured at the wrist and upper arm of the patient might be different . 1.Put the wrist belt on the wrist without any cloth or jewelry, and keep the display screen at the positive side of the wrist. 2.The cuff should be about 1.2cm away from ulna. Lower end of the cuff should be tightened and adhered to the wrist roll. 3.Correct measuring posture is sitting posture, and the wrist belt and the heart should be kept in the same plane.