After medical abortion with 20mmx10mm of uterine cavity residue can not clear the uterus, choose the drug conservative treatment. The treatment means of uterine cavity residue after medical abortion mainly includes purging, drug conservative treatment and expectant treatment. Recent studies have shown that conservative treatment with medication for uterine residuals with a diameter of ≤25mm has obvious efficacy, good compliance, and can reduce surgical complications associated with evacuation. Weekly ultrasound monitoring is needed during pharmacologic conservative treatment to know the size of residual tissue in the uterine cavity and blood HCG human chorionic gonadotropin level. Vaginal bleeding, abdominal pain, and the presence of infection should also be monitored. If there is more vaginal bleeding than menstrual flow during conservative drug therapy, if there is a risk of infection, or if chorionic villous remnants cannot be excluded after 2 weeks of drug therapy, then the uterus will need to be evacuated.