1. Abstinence should be 2 to 7 days before semen collection. 2, abstain from alcohol one week before sperm collection, especially to avoid drunkenness, which has a great impact. 3.For those who take semen at home and bring it to the hospital for examination, the use of condoms is prohibited because there are many spermicidal drugs on condoms; on cold days, semen specimens should be insulated and placed in a close-fitting underwear bag and sent to the examination room within half an hour if possible.