Fetal 37 weeks biparietal diameter is 9.7 may be due to fetal over-nutrition, fetal hydrocephalus and so on, the pregnant woman can reduce eating, and go to the hospital in time. Fetal 37 weeks biparietal diameter is usually 8.5 ~ 9.5cm, biparietal diameter is 9.7 slightly beyond the normal range, may be due to the pregnant woman supplementation of excessive nutrition, resulting in large fetal biparietal diameter, which is a normal physiological phenomenon, but do not rule out fetal hydrocephalus caused. It is recommended that pregnant women reduce their diet, maintain a balanced and reasonable diet, eat more vegetables and fruits, keep a happy mood, etc., and go to the hospital for regular checkups. Pregnant women should go to the hospital in time and be treated under the guidance of the doctor so as not to affect their health.