Low amniotic fluid during pregnancy can be replenished by drinking more water within a short period of time, intravenous infusion and saline injection into the amniotic cavity. 1. Drinking more water in a short time: drinking water can increase the amount of body fluid circulation, so that the amniotic fluid can be replenished more, it is recommended to drink 2,000 ml of water within two hours to achieve the purpose of replenishing amniotic fluid. 2. Intravenous fluids: If drinking water cannot replenish amniotic fluid, you can also replenish amniotic fluid through intravenous fluids, such as saline, to replenish the amount of blood circulation, thus replenishing amniotic fluid. 3. Saline injection into the amniotic cavity: If the above simple methods fail to solve the problem, it is necessary to consider using a specific needle to inject saline into the amniotic cavity to directly replenish the amniotic fluid. If the amniotic fluid is too low, it is recommended to consult a doctor and take appropriate measures under the guidance of the doctor.