ObjectiveTo examine the intrauterine residual tissue in patients with prolonged vaginal bleeding after drug abortion by both B-ultrasound and pathology through cleaning the remnant of uterine, in order to investigate the relationship between prolonged vaginal bleeding after medical abortion with mifepristone and the residual tissues (decidua/villi). MethodsBetween June and December 2011, 144 patients with vaginal bleeding after medical abortion were involved in the study. B-ultrasound and pathology through cleaning the remnant of uterine were adopted to study the residual tissue respectively. ResultsBased on the ultrasound results, the difference in residual tissues was statistically significant between patients with bleeding for 15 days or shorter and patients with bleeding for more than 15 days (P<0.05). The pathological results showed that the difference in decidua and villi on the residual tissues was not statistically significant between patients with bleeding for 15 days or shorter and patients with bleeding for more than 15 days (P>0.05). ConclusionAfter drug abortion, the prolonged vaginal bleeding was correlated with intrauterine residual tissues, and was not correlated with whether the residual tissue was villi or decidua.