Abstract : Chronic hypertension in pregnancy, gestational hypertension, and hypertension in preeclampsia are uniquely challenging conditions for pregnant mothers, because the pathology and treatment methods affect both the mother and the fetus and sometimes cause contradictory health outcomes. Preeclampsia is one of the most worrying complications, especially in pregnancy. Preeclampsia often manifests as new-onset hypertension and proteinuria in the third trimester, which can quickly develop into serious complications, including the death of the mother and fetus.A 35-year-old woman was admitted to the hospital due to menelipsis for 33+5 weeks and was found to have abnormal blood pressure for 5+ months. According to blood pressure measurements and urine protein +- and the condition of placenta, she was hospitalized for pregnancy with chronic hypertension and early-onset preeclampsia. The result of the placental growth factor test was 30.63. A caesarean section was recommended to extract the fetus quickly to avoid the potential harm caused by severe eclampsia. The patient’s blood pressure during the operation was high, which was characteristic of severe eclampsia. Therefore, an emergency caesarean section was performed to ensure the safety of the patient and the fetus. Postoperative eclampsia symptoms disappeared and the placental growth factor index was normal. The patient's postoperative clinical course was smooth and satisfactory.