The normal size of the prostate gland is about 4cm in transverse diameter, 3cm in vertical diameter and 2cm in anterior and posterior diameter. The prostate gland is an important gonadal organ in men and is located behind the pubic symphysis and in the small pelvis. Normally, the prostate gland looks like a chestnut, with a transverse diameter of about 4cm, a vertical diameter of about 3cm, and an anterior-posterior diameter of about 2cm, which is normal. In general, the size of the prostate gland grows with age, while in youth it is in a relatively static growth period. The prostate gland has the function of secreting prostate fluid and participating in urination, urine control and ejaculation. If men do not pay attention to the daily care of the prostate, it will induce prostatitis, prostate hyperplasia, prostate cancer and other diseases, easy to increase the size of the prostate gland, function or disappear, is not conducive to physical and mental health. It is recommended that men strengthen their personal hygiene care and avoid unclean sex. If accompanied by frequent urination, urinary urgency, pelvic pain, loss of libido and other symptoms, should be timely medical examination, in order to clarify the disease and follow the doctor’s instructions for treatment.