The normal range of the amniotic fluid index at 26 weeks of pregnancy is 8-25 cm. In a normal pregnancy, the production and absorption of amniotic fluid are in a dynamic balance, and if there is an imbalance on one side, abnormal amniotic fluid volume can occur. An amniotic fluid index ≥25cm is too much amniotic fluid and ≤5cm is too little amniotic fluid. Amniotic fluid can help the fetus grow and develop, and has the role of buffering external pressure and protection. Too much amniotic fluid can easily lead to risks such as placental abruption and umbilical cord prolapse, and the incidence of preterm delivery increases, which affects the prognosis of the fetus; when the amniotic fluid is too little, the buffering effect disappears and the pressure of the uterus can act directly on the fetus, which may lead to fetal somatic abnormalities and lung hypoplasia. After the abnormal amniotic fluid is found, the cause should be further clarified and treated for the cause, in addition to improving the lifestyle to help regulate it. If you have too little amniotic fluid, you should drink more water to increase blood circulation and indirectly increase the circulation of the uterine placenta to increase amniotic fluid, and do amniotic fluid infusion therapy if necessary; if you have too much amniotic fluid, you should pay attention to a low-salt diet and consume more diuretic foods, such as cucumber, tomatoes and green beans.