The 36th week of pregnancy belongs to late pregnancy, the normal amniotic fluid index is 8-18cm, and the amniotic fluid volume is around 1000ml. If the amniotic fluid index is <8cm, consider low amniotic fluid, if the amniotic fluid index is <5cm, consider too little amniotic fluid, if the amniotic fluid index is >18cm, consider too much amniotic fluid. At 36 weeks, an ultrasound should be done to note the amniotic fluid depth and amniotic fluid index. The amniotic fluid depth refers to the deepest extent of the amniotic pool, and the amniotic fluid index is the sum of the 4 quadrants of amniotic fluid depth, which is relatively more informative. If at 36 weeks, a significant increase in the amniotic fluid index is detected, pay attention to whether the pregnant woman has gestational diabetes and a 75g glucose tolerance test is recommended for screening. If gestational diabetes is diagnosed, it is recommended to control blood glucose through diet and exercise, and the pregnant woman needs to be monitored for fasting blood glucose and 2h postprandial blood glucose. If the amniotic fluid index is significantly decreased, it is important to pay attention to the possibility of acute fetal intrauterine distress. It is necessary to perform fetal heart monitoring, pay attention to whether the baseline fetal heart rate is normal, and also pay attention to the response pattern of the fetal heart. If the amniotic fluid index decreases slightly, it is recommended that the pregnant woman should drink more water, lie on the left side and rest appropriately, and through a period of treatment, review the change in amniotic fluid volume, and if the amniotic fluid volume returns to normal, normal labor and delivery can be performed. In addition, when the amniotic fluid index is particularly high or low, detailed screening should be performed to pay attention to whether the fetus has developmental malformations, a common malformation is the digestive system, which may require surgical treatment after birth.