The normal value of waist circumference for adult Chinese men is less than 85cm, greater than or equal to 85cm and < less than 90cm for central obesity preliminaries, greater than or equal to 90cm for central obesity. The normal value of waist circumference for women is less than 80cm, greater than or equal to 80cm but less than 85cm for central obesity preliminaries, greater than or equal to 85cm for central obesity. Waist circumference measurement method is to use the smallest scale of 1mm soft ruler, in fasting, remove the waist covered clothing, if you can not do, try to wear thin clothing. The measured person's hands hang down naturally, the feet are separated by 30-40cm, the abdomen is relaxed, natural breathing, and the soft ruler is placed at the midpoint of the right axillary line, the upper edge of the hip bone and the lower edge of the 12th rib, which is the narrowest position of the waist, and it is wrapped around the abdomen in the horizontal direction, tightly pressed against the skin, and read at the end of exhalation.