Objective To investigate the clinical value of transvaginal B ultrasound and hysteroscopy in the diagnosis of abnormal uterine bleeding. Methods Retrospectively analyze 202 cases who were preliminarily diagnosed abnormal uterine bleeding from Feb 2004 to Feb 2006. For all the cases,ultrasonography had been done before hysteroscopy,diagnostic curettage had been done to all the EP patients,all the patients received endometrial electrosection through hysteroscope,and pathological examination after operation. Results 51.49% cases were reported abnormal by B ultrasound. 184 cases (91.09%) were diagnosed abnormal by hysteroscopy. 166 cases (82.18%) were reported abnormal by pathological report after endometrial curettage. Conclusions Hysteroscopy diagnosis is an important diagnostic method for abnormal uterine bleeding because of its intuitionistic diagnosis,accurate localizational endometrial curettage and highly specific diagnosis. But the hysteroscopy can not replace tissue pathological examination of endometrial curettage.