At 29 weeks of pregnancy, the maximum depth of amniotic fluid is 2-8 cm and the amniotic fluid index is 5-25 cm. Because the amniotic fluid is fluid and there may be some limitations in ultrasonography, there may be some errors in amniotic fluid monitoring. At 29 weeks of pregnancy, if the amniotic fluid depth is below 2cm and the amniotic fluid index is less than 5cm, the amniotic fluid is too small. If the amniotic fluid is too small, the fetal survival space is limited, the fetal activity is restricted, and intrauterine hypoxia and fetal distress easily occur. On the basis of dealing with the original disease, detailed assessment of the fetal condition in the uterus, medication to promote fetal lung maturation, more water for pregnant women, improving placental circulation, etc. are needed to promote amniotic fluid production and regular review of ultrasound. If the amniotic fluid volume increases and the fetus is in good intrauterine condition, the pregnancy can continue. If the amniotic fluid is too low without significant improvement, or the fetus is in poor intrauterine condition and fetal distress is suspected, the pregnancy should be terminated as soon as the fetus is mature. If the depth of fetal amniotic fluid is more than 8 cm and the amniotic fluid index is greater than 25 cm, it is considered as excessive amniotic fluid. With the rise of the uterine fundus, the pregnant woman may also experience diaphragm upward compression of the lungs and symptoms such as dyspnea and wheezing, which require regular review of ultrasound, close monitoring and, if necessary, amniotic fluid reduction by puncture.