Men who want to know if their sperm is normal can go to the hospital for a routine semen examination. There are more items included in the sperm test. These include semen color, semen volume, liquefaction time, sperm density, sperm vitality, and semen pH. The color of normal semen is clear off-white or milky white, and can be light yellow if the abstinence time is too long, but if semen appears dark yellow, blood in semen, dark red and a series of other colors then it is not normal. The amount of semen that a male ejaculates each time is around 2ml to 6ml, less than 1ml is called a decrease in semen volume, more than 6ml is called too much semen volume, whether too much or too little semen volume may cause infertility. The time of semen liquefaction is also the main cause of infertility. Normally, semen will become liquid in about 5-30 minutes, but patients with prostate disease or seminal vesicle disease will have semen that is not liquefied. The density of sperm is crucial, he refers to the number of sperm contained in each milliliter of semen. Normally the number of sperm in each milliliter of semen is more than 20 million, if less than 20 million belongs to oligospermia, the percentage of active sperm within one hour after sperm discharge should not be less than 60%. Sperm motility refers to the ability of sperm to move, and low motility can cause infertility. Semen is weakly alkaline with a PH value between 7.2 and 7.8. If the PH is less than 7, it is acidic, and if the PH is greater than 8, it is alkaline, and either acidic or alkaline will restrict sperm function. By examining the above items, we can correctly assess the fertility of men, and if there are problems with any of these items we can target treatment to achieve pregnancy.