The success rate of IVF for unexplained infertility is not high. IVF is an assisted reproductive technology, and its own success rate will be limited to a certain extent. If the cause of infertility is known in advance before doing IVF, it can be risk-avoided in advance, so that the success rate of IVF can be increased. There are many reasons for infertility, before IVF the woman should rule out tubal factors, ovulation abnormalities and endometrial abnormalities, etc. In addition to the female infertility need to make a test, the man also need to cooperate to complete the infertility test, so that can better determine the unknown cause of pregnancy, can be more targeted treatment. Patients undergoing laparoscopy or endometriosis tests also need to be observed for internal pelvic lesions so that the specific cause can be determined and the chances of IVF success can be improved.