It is advisable for pregnant women to take oxygen for 10-30 minutes each time, which can be once in the morning and once in the afternoon for half an hour each time. After 1 week of continuous oxygen intake, an interval of 1-2 weeks is recommended. Insufficient oxygen in maternal blood can lead to fetal hypoxia. Oxygen intake can increase the blood supply to the placenta, but it should not be used for a long period of time. It is usually recommended to stop oxygen therapy when the problems of fetal hypoxia and intrauterine growth retardation are relieved. So as not to cause the concentration of blood oxygen in the pregnant woman’s body is too high, leading to the pregnant woman’s internal environmental disorders, and the fetal blood vessels have a certain stimulating effect, and may even cause fetal retinopathy, affecting the development of fetal eyesight. Pregnant women should not blindly inhale oxygen at home by themselves, and closely observe the fetal movement, if abnormal fetal activity is found, it is possible that the fetus is hypoxic and needs timely treatment.