Low sperm motility refers to the fact that the number of viable sperm in an hour after a male ejaculates is less than 40%. The causes of low male sperm motility are mainly the following: a. caused by varicocele, varicocele will not only cause male testicular atrophy, but also cause a decrease in sperm motility; b. no sex for a long time, if men do not have sex for a long time, it will cause high sperm density and affect sperm motility; c. semen is not liquefied, after male ejaculation, semen can not be liquefied within 20 minutes Sixth, poor living and eating habits, prolonged smoking, drinking, medication and staying up late can cause low sperm quality in men. Low male sperm motility is the main cause of male infertility, it is necessary to find out the specific factors and deal with the symptoms.