Low sperm motility of 2% may be related to reproductive system infections, varicocele and testicular spermatogenic dysfunction. 1. Reproductive system infection: most pathogenic bacteria spread from the urethra to the reproductive system, such as epididymis, vas deferens and prostate infections. It can cause variation of seminal plasma, whose oxygen supply, acidity and alkalinity, nutritional situation and metabolism are unfavorable to sperm activity and survival. 2. Varicose veins of the spermatic cord: mostly caused by the underdevelopment of the walls of the veins or the continuous increase of abdominal pressure, such as sedentary or walking at work, coughing, constipation and so on. Varicocele can lead to testicular hypoxia due to the obstacle of venous blood reflux and increase of metabolic wastes such as prostaglandin and serotonin in venous blood, which leads to low spermatozoa viability. 3. Testicular spermatogenic dysfunction: it may be that the patient was infected with mumps as a child and suffered from orchitis. If the spermatogenic epithelium of testis is not fully mature or damaged and thinned, the sperm produced will be of poor quality and weak motility. In addition to the above factors, low sperm motility may also be caused by long-term smoking, alcoholism, lack of trace elements and other factors. When low sperm motility occurs, it is recommended to go to a regular hospital in time, follow the doctor’s instructions for further examination, clarify the cause with the doctor’s help, and carry out targeted treatment or therapy, in order to strive for a speedy recovery.