1, because the sperm of patients with weak sperm have certain quality problems, and even if such sperm can combine with the egg, it is not certain whether the result is ideal. 2. There is a certain chance of conception in weak spermatozoa, even in mild weak spermatozoa sperm motility is lower than normal, so that the quality of sperm is not guaranteed, and conception in this case still has some disadvantages from the eugenic point of view. Normally, only forward-moving sperm can ensure that the sperm will reach the abdomen of the fallopian tube and unite with the egg to form a fertilized egg. However, in the case of weak spermatozoa, if the spermatozoa are affected by some factor, especially those that cannot move forward, the spermatozoa will not be able to swim to the egg’s location in the best time and there is no way to achieve the conception process. 4, many pregnant women may have premature birth or miscarriage during pregnancy, which may also be caused by the lack of sperm quality, so weak sperm should be given sufficient attention. 5, resulting in male acquired factor disorders, many male patients will appear the symptoms of weak spleen and stomach, essence and blood deficiency, because the kidney essence suffered a deficit, so the testes will not be able to produce sperm, or produce sperm vitality is simply not enough. 6, affect the sperm-producing function of the testes, weak sperm will cause the testes of male patients to have a weakened sperm-producing function, or even atrophy. There are also some local factors, for example, the testicles themselves are congenital dysplasia, patients suffer trauma, inflammation of the testicles, etc. Systemic factors are mainly endocrine diseases, genetic diseases, industrial hazards, etc. 7, leading to vas deferens blockage, because of inflammation, injury or deformity, weak spermatozoa can lead to epididymal duct, vas deferens and ejaculatory duct blockage.