If the symptoms of weak sperm are mild, the success rate of IVF is higher, otherwise the success rate is lower. Weak sperm is mainly caused by congenital sperm development abnormality, reproductive system infection, endocrine disorders, bad life habits, harmful environment and other factors. It causes a decrease in the quality and quantity of normal sperm and an increase in the rate of sperm deformities, which affects the chances of conception and fertility, and may lead to infertility in severe cases. Therefore, patients with weak spermatozoa usually use IVF for fertility. The success rate of IVF is higher when the number of sperm that meets the IVF indications is higher when the symptoms of weak sperm are milder, and lower when the number of sperm that meets the IVF indications is lower when the symptoms of weak sperm are more severe. So the success rate of doing IVF depends on the severity of weak sperm. Patients who have weak spermatozoa should go to regular hospitals in time and be treated under doctors’ guidance so as not to affect the success rate of IVF.