The probability of pregnancy in posterior uterus position is more than 90%. If the posterior position of the uterus of a woman is more obvious, the greater the angle between the cervix and the uterine body, that is, the more severe posterior tilted retroflexion position, the sperm can not pass through the cervix into the uterine cavity, the chances of pregnancy in posterior uterus position will be greatly reduced. The normal position of the uterus is divided into anterior, median and posterior. The anterior and median positions of the uterus do not affect the smooth passage of sperm and the chances of pregnancy are very high, as long as the posterior position of the uterus is not posteriorly tilted and retroflexed. If the angle of posterior tilt and retroflexion is very large, and the sperm cannot enter the uterine cavity and lead to infertility, it can be corrected by means of manual reset into neutral or anterior position or surgery to facilitate the smooth entry of sperm into the uterine cavity and improve the chances of pregnancy.