If you want to check the semen: first of all, the patient should go to the hospital in advance to consult, get the relevant precautions according to the guidance of professionals, keep the specimen in time to send for examination. General semen check need to pay attention to: before checking semen patients should abstain from sex for about 5 days, quit smoking, quit drinking, avoid taking drugs that have an impact on spermatogenesis, and avoid testicles being hit by external forces. Too short a period of abstinence will lead to too little semen volume or low sperm density, while too long an abstinence will result in too many dead sperm and less active sperm, all of which will affect the test results. Secondly, the semen specimen should be retained in the morning, patients need to wash their hands, vulva, flip open the foreskin to clean the glans and empty the bladder, to avoid contamination of the semen specimen with prepuce scale and urethral secretions. Relax in a quiet and private environment, and discharge the semen specimen through masturbation or automatic semen retrieval machine. Finally, the patient should send the semen specimen to the laboratory for examination as soon as possible after the specimen is removed to avoid affecting the test results.