Abstract: Objective: To improve diagnosis and differential diagnosis of the ectopic pregnancy. Methods: The uterus and paramerium were examined by trans-abdomen sonography and transvaginal sonography. The analysis was conducted with clinical data. Results: Forty-one of 50 patients were diagnosed as ectopic pregnancy, including one with belly cavity gestation, one with cornual pregnancy and 7 with misdiagnosis. The diagnosis for these patients was confirmed by operation and pathology. Conclusions: Ultrasonic plays an important role in the early diagnosis and differential diagnosis of ectopic pregnancy.