Amniotic fluid protects the fetus from being squeezed and also allows the mother to reduce the discomfort caused by fetal movement. If the amniotic fluid is low at 30 weeks of pregnancy, if the pregnant woman has no pathological condition and the amount of amniotic fluid reduction is not much, measures such as dietary regulation, hydration therapy and monitoring fetal movement can be taken. In addition, some pathological factors such as chromosomal abnormalities, microthrombosis, gestational hyperemia and fetal urinary system anomalies can also lead to low amniotic fluid, which should be handled in different situations. Non-pathological conditions 1, dietary regulation: pregnant women are advised to drink more water, and can also drink more soy milk, which contains more progesterone and can increase the amount of amniotic fluid; 2, hydration therapy: pregnant women need to be hospitalized, more than 3000ml of intravenous fluids per day, and can also be used to increase the amount of amniotic fluid by amniotic cavity perfusion; 3, monitoring fetal movement: pregnant women are advised to pay close attention to monitoring fetal movement, and if necessary, to do fetal heart monitoring examination. If intrauterine distress is found, it is recommended to lie on the left side while receiving oxygen and using drugs such as dexamethasone to promote fetal lung maturation. If the fetal hypoxia is very severe, a cesarean section is needed to terminate the pregnancy. Pathological conditions 1. Chromosomal abnormalities: Cord blood puncture can be done at 30 weeks of pregnancy to note whether the fetus has normal chromosomes. If the fetus is found to have serious chromosomal abnormalities, it needs to be induced to give up the fetus; 2. Microthrombosis: if the pregnant woman has autoimmune antibodies, small microthrombi will be formed at the mother-fetus interface, and these microthrombi will lead to a significant decrease in blood flow at the mother-fetus interface, thus leading to low amniotic fluid, which can be removed by the anticoagulant effect of low molecular heparin to increase the amount of amniotic fluid; 3. Hypertension during pregnancy: if at 30 weeks If the amniotic fluid is found to be low, attention should be paid to whether there is a decrease in placental function caused by hypertensive disease during pregnancy, which may cause low amniotic fluid. It is recommended that such pregnant women actively treat the original disease and take oral antihypertensive drugs to control blood pressure under the guidance of the doctor; 4, urinary system malformation: 30 weeks of pregnancy amniotic fluid is low, you need to do fetal 3D ultrasound to check whether the fetal urinary system has malformations. If it is found that the abnormality causes the fetus to urinate less and causes low amniotic fluid, prenatal diagnosis should be done in time.