Ejaculating just an hour before doing a semen test has an effect on the results. The requirements for semen test are no sex for 2~7 days before semen specimen collection and avoid taking androgenic drugs, otherwise it will affect the accuracy of the result. The purpose of semen examination is to check the function of spermatogenesis, semen quantity, smell, color and liquefaction time, as well as sperm count, power and morphology. It can help in the diagnosis of azoospermia, seminal vesiculitis, testicular atrophy and other diseases. Before the examination, you need to clean the perineum, choose the appropriate specimen collection method to avoid contamination, and send the specimen for examination immediately after collection. If the test result is abnormal, it cannot be judged by the result of 1 test alone, the specimen should be collected again for examination at an interval of 7~14 days, and a more accurate result can be obtained in 2~3 consecutive times.