Weak spermatozoa has many causes, such as common bad habits, such as smoking, drinking, overweight, often stay up late, and then a varicocele, inflammation, etc., will cause sperm motility is relatively poor, because of poor sperm motility, the probability of conception is lower. Once conceived does not affect the development of the fetus, the greater impact on the development of the fetus is sperm morphology, such as high sperm deformity rate, the relationship is a little more, so there is no need to worry about patients with weak sperm have an impact on the fetus. Fertility involves three links, namely sperm count, sperm motility, and sperm morphology. After normal couple sex, sperm have to pass through the female reproductive tract, through the uterus, and through the fallopian tube to meet the egg, called the running process. So the sperm can’t run forward, for example, below the minimum reference value, it is diagnosed as weak spermatozoa, the sperm can’t run forward, the probability of conception decreases, so people with poor sperm motility will mainly affect the ability to conceive.