Male azoospermia is mainly divided into obstructive azoospermia and non-obstructive azoospermia. Obstructive azoospermia mainly refers to the testicular spermatogenic ducts are not smooth, sperms can not be discharged, testicular size is normal, sex hormones are normal, so there is no special performance, the main manifestation is that no sperms are seen in many times of semen examination, and a small portion of the patients can be touched with vas deferens dysplasia. Non-obstructive azoospermia mainly refers to abnormal testicular spermatogenic function, there are many manifestations, such as sex hormone abnormality, chromosomal abnormality, etc. However, there is no special manifestation in the clinical life, only in the birth of a child is found in the semen did not see spermatozoa, and there are some patients who manifested cryptorchidism, testicles are relatively small, usually less than 8 ml and so on.