The main methods to increase amniotic fluid are rehydration and amniocentesis perfusion. 1. Supplemental hydration: water can be replenished by rehydration fluid and drinking water. Supplementation of fluid can increase maternal blood volume, so that the amount of circulating blood passing through the placenta into the fetus increases, but the osmotic pressure decreases, causing an increase in fetal renal blood flow and an increase in the amount of urine, thus increasing the amount of amniotic fluid. Pregnant women can also reduce plasma osmolality and increase amniotic fluid volume by drinking large amounts of water within a short period of time. It is recommended that women during pregnancy drink more than 2,000-2,500 milliliters of water per day to avoid dehydration, which can affect amniotic fluid production. 2. Amniocentesis: It is suitable for pregnant women who have too little amniotic fluid but the fetus does not have growth and developmental abnormalities. Due to the high requirements for the operator, there are risks of premature rupture of membranes, preterm labor and miscarriage during the procedure, so it needs to be carried out in a professional hospital. It is recommended that women during pregnancy should undergo regular obstetric checkups, and if a decrease in amniotic fluid is detected, it should be further determined whether the fetus has growth and developmental abnormalities. Only if there is no fetal abnormality and the fetus is not yet full-term, amniotic fluid can be increased under the guidance of professional doctors.