Men generally have better sperm quality at the age of 20-30 and the best sperm quality about 5-7 days from the last sperm discharge. The quality of male sperm is affected by a variety of factors, such as sperm malformation rate of more than 20% in men who smoke for a long time, and long-term heavy alcohol consumption can also affect sperm quality. In addition, high temperature environment can also affect the survival rate of sperm. In general, when the normal temperature is 2°C-3°C higher, the sperm will not be viable. Secondly, frequent sexual intercourse can lead to chronic prostate congestion and aseptic prostatitis, which directly affects semen quality. Sexually transmitted diseases can lead to inflammatory damage to the reproductive system, and many pathogens can also directly induce an immune response and produce anti-sperm antibodies. Sperm quality can also be affected by long-term exposure to nuclear radiation and x-ray exposure. Therefore, men can eat more arginine-containing foods to improve semen quality, such as soybeans, fish, yams, ginkgo, watermelon, pumpkin, etc., and should usually work and rest regularly and strengthen exercise.