If a pregnant woman needs oxygen, she can be in any position before mid-term pregnancy, as long as she lies down in bed and rests in a position that she feels comfortable. If oxygen is given in late pregnancy, it is recommended to lie on the left side, because when entering late pregnancy, the uterus will appear right rotation, which will clinically reduce the local blood circulation of the uterus, so when lying on the left side, the right rotation will be corrected, so that the blood circulation of the uterus itself will be normalized, and the clinical effect of oxygen will be better in this position. The main reason for giving oxygen to pregnant women in clinical practice is that the fetus has symptoms of hypoxia in the uterus, such as frequent fetal movement or reduced fetal movement in clinical practice, and oxygen should be given for treatment.