Magnesium sulfate has no effect on the fetus if injected in normal doses by a pregnant woman. Magnesium sulfate has the effect of relaxing smooth muscle and relieving menstruation, especially in the late stages of pregnancy, and it also has the effect of preserving the fetus if there are signs of miscarriage. If there is an increase in blood pressure during pregnancy, magnesium sulfate needs to be treated with a sedative antispasmodic. During this period should also pay attention to relaxation, pay attention to diet control, low salt, low fat diet, develop good habits, do not stay up too late, can control the blood pressure within a reasonable range. If there are signs of miscarriage, in the use of magnesium sulfate to protect the fetus during the period should also pay attention to rest, do not exercise strenuously, can play a good role in preserving the fetus, pregnant women and the fetus will not have an impact.