Because pregnancy is a matter for both spouses, there are factors that affect pregnancy from both sides. The male partner mainly includes sexual dysfunction, such as erectile dysfunction, which can affect pregnancy by not ensuring sex at the time of ovulation. There are also sperm causes, commonly oligosperm, weak sperm, azoospermia or malformed sperm, all common factors in men. The main factors that affect pregnancy in women include the following: first, cervical factors, such as vaginitis leading to narrowing of the cervical opening or scarring of the cervix from previous surgery, can affect the entry of sperm into the woman’s uterus, which in turn affects fertilization. Uterine factors, such as endometrial polyps or submucosal fibroids, which occupy a certain volume in the uterine cavity, can also affect embryo implantation and cause infertility. Tubal factors, such as incompetent or poorly functioning fallopian tubes or tubal inflammation in the woman, can cause sperm and eggs to fail to unite and affect pregnancy. Ovulation disorders, such as the very common female polycystic ovary syndrome, is the female primary non-ovulation, if there is no ovulation, sperm in, still can not fertilize pregnancy.