Male infertility is plaguing more and more people, and studies have shown that there is a steady decline in semen quality among men worldwide. There are many factors contributing to the decline of semen quality in men, including environmental deterioration, accelerated pace of life, and changes in people’s dietary habits. So, what tests should infertile men do? First of all, examination of reproductive organs is essential. Including the volume and texture of testicles, epididymis, inflammation, nodules, varicose veins, vas deferens and so on, these tests are mainly done through the doctor’s palpation; Secondly, a routine examination of semen should be done, including sperm density, vitality, semen with or without infections, anti-sperm antibodies and so on; If the volume of semen is particularly low (normal ejaculation of 2-6 ml), it is also necessary to check the biochemistry of the plasma. Some indicators, including seminal plasma fructose, -glucosidase, etc., as well as transrectal ultrasound, to see whether there is an obstruction or disfluency of the vas deferens tract.