The effect of preeclampsia on the fetus has to start from its etiology. Preeclampsia is actually due to vasospasm causing impaired blood supply, vascular endothelial damage, causing abnormal coagulation, or microvascular thrombosis, which will cause abnormal conditions to the fetus that supplies blood. Specifically: 1, blood supply disorders first of all the child may develop abnormally, develop smaller, intrauterine growth restriction than the normal months of fetal growth; 2, there will be signs of hypoxia, such as insufficient blood supply fetal acute hypoxia; 3, microvascular changes, including peripheral circulation coagulation disorders, microthrombosis, may cause local ischemia, necrosis, infarction of the placenta, once the placenta formed a hematoma or bleeding, it is called placental abruption. It is called placental abruption. Placental abruption is clinically serious, and once it occurs, it may endanger the life of the child, and in serious cases, emergency surgery is needed to get the child out.