Excessive amniotic fluid in pregnant women can be determined by monitoring 4D ultrasound, Down’s syndrome screening, non-invasive DNA or amniocentesis, cord blood puncture, umbilical cord blood puncture test, and monitoring maternal blood sugar to determine if there is fetal malformation. 1. 4D ultrasound: 4D ultrasound is an effective way to diagnose excessive amniotic fluid and determine fetal malformation. If the fetal digestive tract is obstructed and cannot be swallowed, it will cause excessive amniotic fluid. Therefore, the ultrasound can determine whether the fetus has anatomical development problems. 2.Down’s syndrome screening: by checking the nuchal translucency layer, nasal bone dysplasia, cardiovascular malformation, methemoglobin, free estriol, etc., we can initially understand whether the fetus has abnormal rows and chromosomal abnormalities; 3.Non-invasive DNA: the free fetal DNA in the blood of pregnant women can be detected, blood can be drawn and the risk of Down’s syndrome can be determined by means of genetic sequencing; 4.amniocentesis: the 16th-24th weeks of pregnancy, over 34 years old, the risk of Down’s syndrome can be determined. 16-24 weeks of gestation, senior pregnant women over 34 years old, pregnant women with Down’s syndrome at home, pregnant women who have already given birth to a child with Down’s syndrome, and those who have had blood drawn to check whether they are at high risk, need to undergo amniocentesis to further check whether there are chromosomal abnormalities; 5.Cord blood puncture: under the detection of color ultrasound, puncture the abdomen of the pregnant woman, enter the uterine cavity, draw a small amount of cord blood and extract the DNA from it, which can check whether the fetus has 6, fetoscopy: amnioscopy or hysteroscopy, through the abdominal wall, uterine wall into the amniotic cavity, direct observation of the fetal body surface, to see whether the fetus has abnormalities; 7, monitoring maternal blood sugar: poor control of maternal blood sugar can also lead to excessive amniotic fluid, if high blood sugar, can enter the fetus through the umbilical cord, causing the fetus body blood sugar, high blood sugar will have a diuretic effect on the fetus, resulting in more amniotic fluid. The high blood sugar will have a diuretic effect on the fetus, resulting in more amniotic fluid. If the excessive amniotic fluid is caused by high blood sugar, the blood sugar should be controlled in time. When a pregnant woman has too much amniotic fluid, her stomach is usually bigger, so she should pay more attention to rest and should not engage in physical labor, and can elevate her lower limbs more to increase venous return and reduce compression. Also pay attention to diet regulation and low salt diet. If the pregnant woman has any discomfort, she needs to go to the hospital in time, and the doctor can deal with it according to the specific situation.