The normal male semen is milky white or slightly yellowish, there are obvious yellow staining possible reasons: 1, long time without semen discharge semen can be yellow, usually without any ejaculation pain and after repeated ejaculation, semen gradually changed to milky white, is a long time without semen discharge and no need to carry out drugs or examination; 2, there is a seminal tract infection, there may be pus mixed in the cumulus, this time can appear yellow It is recommended to take semen for routine laboratory tests and semen culture, and the presence of pus cells indicates the presence of purulent infection, which requires further anti-infection treatment; 3, bilirubin level and other examinations.