Weak sperm usually refers to weak spermatozoa, which does not cause preeclampsia. Weak spermatozoa refers to low sperm motility and a decrease in the total number of sperm moving forward. Weak sperm motility can lead to a decrease in the sperm’s ability to fertilize, which can cause a decrease in the probability of conception. Weak sperm does not mean that a pregnancy cannot be successfully conceived. If a woman becomes pregnant normally, there is usually no effect on the fetus. Weak spermatozoa mainly affects the fertilization process. However, once a successful pregnancy is achieved with weak spermatozoa, it usually does not affect the normal development of the embryo. Men with weak spermatozoa should change their lifestyles by not smoking, drinking alcohol, staying up late, staying away from hot environments, as well as not being exposed to toxic and harmful chemicals. Appropriate exercise to improve the physical fitness of the body, especially aerobic exercise can improve the sperm vitality and the total number of sperms. Eat more high protein food and fresh vegetables. Most of the weak spermatozoa have no clinical symptoms, and prolonged infertility after marriage should go to the hospital. Some patients may be accompanied by primary disease symptoms, such as urinary urgency, urinary frequency, urinary pain, semen liquefaction and so on. It is recommended that patients with weak spermatozoa go to a regular hospital as soon as possible for routine semen examination.