Echo enhancement of fetal intestinal canal is an abnormal condition, and the presence of fetal intestinal canal echogenicity needs to be alerted to abnormal fetal development. The causes of enhanced fetal intestinal echo can be divided into the following categories. The first one is normal physiological cause. Fetal ultrasound can indicate enhanced intestinal echo when the fetal intestine accumulates feces and is not expelled. The second, fetal chromosomal abnormalities. Many fetuses can have abnormal development of the digestive tract due to chromosomal abnormalities. Local accumulation of abnormal secretions and excretions in the intestinal canal. Widening of the intestinal canal and echogenic enhancement are seen on ultrasound cues. The third type, intra-amniotic hemorrhage. Intra-amniotic hemorrhage is a common cause of echogenic enhancement of the intestinal canal. Blood from the amniotic cavity can collect in the intestinal canal by the fetal digestive system. Common causes that can cause intra-amniotic hemorrhage include trauma, amniocentesis, placental abruption, and other invasive factors. Under normal circumstances, there is no spontaneous bleeding in the amniotic cavity. The fourth type, fetal infection. When intrauterine infection occurs in the fetus, enhanced fetal gut echo can occur. In summary, fetal intestinal tube echogenicity can be a normal physiological phenomenon or an abnormal phenomenon.