The routine examination of semen is usually done by masturbation to retrieve sperm, and after retrieving the sperm, you go to the laboratory to do the examination. I. Liquefaction time of sperm. The liquefaction time of sperm below room temperature is within 60min. Two, observe the color of semen, the color is usually grayish white. Third, the volume of semen, at least 1 time in 2ml or more. The pH of the semen is between 7.2-8 and the concentration of sperm is above 20×10^6/ml. Sperm viability of 75% or more, sperm motility of 50% or more is classified as A and B. Sixth, the morphology of spermatozoa, more than 30% should be normal. White blood cells should be less than 1×10^9/L.