Cigarettes, alcohol: nicotine in cigarettes not only reduces the secretion of sex hormones in the male body, but also has a direct killing ability for sperm. Ethanol is a known testicular toxicity, long-term alcohol consumption will induce endocrine and reproductive function damage. Zinc deficiency: partiality and picky eating, do not like to eat animal food, long-term will make the body zinc content decline. And zinc deficiency will make libido and sexual function decrease, sperm count decrease. Testicular temperature: It has been reported in the literature that an increase of 0.8 degrees Celsius in testicular temperature has an inhibitory effect on spermatogenic tissues, and an increase of 1 degree Celsius has a direct damage to spermatogenic cells. Therefore, patients with weak spermatozoa and deformed spermatozoa should avoid sitting for a long time, wearing tight underwear, sauna, welding and boiler work. Sexual frequency: too frequent intercourse will reduce the amount of sperm in each ejaculation of semen, and too long a period of abstinence will lead to sperm aging and loss of vitality. These can lead to a decreased chance of pregnancy.