1, smoking and alcohol: nicotine and alcohol substances on the testicular spermatogenic epithelium has direct toxicity, due to the individual differences in human poor dramatically different, tolerance is not the same, the degree of harm to each person varies, but more can cause sperm development deformities, the number of reduced even if the birth of a child, the malformation rate of the fetus is higher than that of non-smokers. Consultation of male patients during the consultation must avoid smoking and alcohol, especially alcohol (including beer), at least until his wife’s pregnancy. 2, long-term tight pants and hot water bath: testicles produce sperm optimal environment for 35-36 ℃, 1-2 ℃ lower than the normal body temperature. All of the above situations will make the scrotum local environment temperature rise, so that sperm production is reduced, the activity rate is reduced, the deformity rate increases. 3, sexual life: sexual production is too frequent, the sperm content of each ejaculation is reduced, and the maturity of sperm is not enough to reduce the chances of conception. But too little intercourse (less than 1 time per week) will make the testicular metabolism lower, will also cause sperm quality decline, and too little sex is not conducive to the woman’s ovarian metabolism. 4, other factors: age, environmental pollution, drugs, diet, infection, etc. can cause sperm quality decline, overwork will also affect the quality of sperm.