Abstract: Objective：To investigate the volume contrast imaging C-plane（ VCI-C plane）， 3-D Glassbody mode and transvaginal color Doppler ultrasound in diagnosis of ectopic pregnancy（EP）characteristic basis，in order to improve the accuracy of diagnosis of EP. Methods：188 patients with suspected early ectopic pregnancy，examined with 2-D transvaginal ultrasonography（combined with transabdominal ultrasonography necessary） and VCI-C plane + Glassbody model， to observe mass′ support artery distribution and spectrum. Results：Among the 188 cases，183 cases were diagnosed promptly.①The attachment area had the gestational sac visible within the embryo and/or yolk sac，there were 17 cases of fetal heart beat，9.0%. ②The Donut syndrome（tubal ring ），including 98 cases of Donut syndrome，52.1%. ③The attachment area can be explored mixed mass，sometimes accompanied by a small amount of fluid，including 60 cases， 31.9%. ④The other part is not typical case only with the pelvic cavity accumulates liquid，including 8 cases，4.3%. Diagnosis coincidence rate was 97.3%. Conclusions：Transuaginal sonography combined with CDFI/CDE can obtain ectopic pregnancy in the early diagnosis accurately and quickly，that's the good means. VCI-C plane ultrasound imaging combined with 3D-Glassbody imaging mode have a large amount of information，increasing the contrast resolution and signal to noise ratio，and can provide more detailed information than 2D.

Key words: Ultrasonography, doppler, color, Imaging, three-dimensional, Pregnancy