The normal sperm rate of twenty percent is considered to be 20% sperm viability, which is weak spermatozoa. It can be regulated by food, drugs, surgery, etc. It may be due to malnutrition, urinary tract infection, varicocele and other reasons. 1. malnutrition: the body has anemia, zinc deficiency, lack of other trace elements, etc., may also affect the quality of sperm, should be diversified diet, nutritional balance, lack of what timely supplement, eat more nuts, lean meat, vegetables, fruits and so on. 2. urinary tract infections: prostatitis, seminal vesiculitis, cystitis, urethritis and other infectious diseases, may also affect the quality of sperm, can be under the guidance of the doctor to take ofloxacin, cephalosporin and other antibiotics treatment. 3. Varicose veins: Varicose veins can cause local circulatory disorders, which can affect the spermatogenic function of the testes, leading to abnormal sperm quality, and generally need to take surgical treatment. It is recommended to go to the hospital for examination to clarify the cause of the disease and take appropriate treatment measures as prescribed by the doctor to avoid abusing drugs.