1, the cause of infertility is relatively simple; infertility has very many causes, in addition to some known causes, there are also many unclear causes, which has a relatively large constraining effect on the treatment of infertility. For patients who choose IVF technology, their infertility causes are relatively simple, such as simple tubal obstruction, no other lesions, their situation for IVF surgery will be relatively good. 2. Younger age; because human reproductive capacity definitely decreases with the rise of age. It is generally believed that it is best for women to be able to solve their fertility problems before the age of thirty-five, because after that, their fertility function declines more significantly.