Objective To investigate the imaging characteristics of endometrial polyps by using transvaginal ultrasound and analyze the causes of misdiagnosis. Methods Fifty-seven patients pathologically diagnosed of endometrial polyps were retrospectively analyzed. Results The endometrial polyps had its own characteristics of ultrasound images, especially the lesion, size, shape, echo, border, color Doppler flow imaging (CDFI) and so on. Conclusion Endometrial polyps has some special features on ultrasound image. Inspection in the secretary period, along with endometrial hyperplasia of the merger as well as multiple myoma the merger may result in misdiagnosis.