Normal people in the 60 minutes after the discharge of sperm, sperm activity rate in the 80% ~ 90% reference interval, at least also need to > 50%, sperm activity rate 38% below the normal value. Sperm activity rate is directly observed through the microscope activity of sperm as a percentage of all sperm, sperm activity rate decline is generally an important factor in male infertility, less than 40%, can lead to infertility, so sperm activity rate of 38% need to find out the reasons for the diagnosis of the cause of the active treatment. Decreased sperm motility may be related to physical factors such as long-term exposure to high-temperature environments and radiation, as well as chemical factors such as ethanol and estrogen. Pathologic causes such as varicocele, syphilis, and gonorrhea can also cause decreased sperm motility. When sperm motility is abnormal, the cause should be clarified under the guidance of a doctor in time for active treatment.