If the endometrium is still thin by ultrasound examination 1 year after the abortion, often accompanied by a significant decrease in menstrual flow, combined with the clinical history, it is highly suspected to be caused by incomplete adhesions in the uterine cavity, and if necessary, hysteroscopy can be done. If adhesions are found in the uterine cavity under the hysteroscopy, they can be separated in time, and after separation, a birth control ring can be inserted into the uterus, mainly for preventing the adhesions from reoccurring. In the postoperative period, appropriate medication should be given, mainly to make the uterine lining grow, and can be taken orally to supplement the Jiale for three consecutive menstrual cycles. If there is a significant decrease in menstrual flow after the abortion, it should be examined and treated promptly. If the thinness of the endometrium after one year is caused by uterine adhesions, it will make it difficult to be separated by hysteroscopy.