After three miscarriages have not been pregnant may be the occurrence of chronic tubalitis, so that bilateral tubal obstruction, or the occurrence of chronic endometritis, so that the lining adhesion, the chances of conception decreased. In this case, follow-up examinations should be performed, either bilateral tubal iodine oil angiography can be performed to know the patency of the tubes, or hysteroscopic bilateral tubal cannulation can be performed directly to know the patency of the tubes. Hysteroscopy is also performed to see if there are any adhesions in the endometrium. If there are adhesions, hysteroscopic adhesion detachment will be performed, and estrogen will be applied postoperatively to further minimize subsequent recurrence of adhesions, and an intrauterine device will be applied if necessary. If conception is still unsuccessful after the above treatments, assisted reproduction techniques may be required.