The male reproductive system consists of four parts: testes, reproductive ducts, accessory glands and external genitalia. 1. Testes: The testes are sperm-producing organs that mainly secrete androgens. Anatomically, the left side is slightly lower than the right side and wrapped inside the scrotum. The shape of testis is slightly flattened ovoid, and the normal volume is about 20ml. 2. Reproductive ducts: consist of epididymis, vas deferens, ejaculatory ducts and urethra. Sperm are temporarily stored in the epididymis, which improves the structural integrity of the sperm cell membranes and enhances the vitality of sperm so that they can be smoothly discharged from the vas deferens, ejaculatory ducts and urethra during the subsequent ejaculation process. 3. Accessory glands: The accessory glands include the prostate, seminal vesicles and urethral bulbous glands. Seminal plasma comes from the secretions of the accessory glands and the genital ducts, and with the spermatozoa make up the semen. 4. External genitalia: The external genitalia include the scrotum and the penis. The penis is mainly composed of three columnar spongiosa, and the urethra of the penis is threaded between the urethral spongiosa, which is the male organ of sexual intercourse. The various parts of the male reproductive system are closely linked, the patient regardless of which part of the discomfort symptoms, should be timely to the regular hospital for treatment.