I. Etiology 1. amyloid calcified bodies formed by nucleoproteins and small amounts of fat in the prostate alveoli or ducts. 2, the prostate infection stone formed by the precipitation of calcium salts and ammonium magnesium phosphate in the prostate fluid. 3, urine prostate duct reflux, urine components deposited in the prostate ducts to form stones. Second, prevention 1, prostate stones and prostate infection is closely related, active treatment of chronic prostatitis, can prevent stone formation. 2, the prostate tube urine reflux is an important reason for the formation of prostate stones, a lot of alcohol can aggravate the reflux of urine in the prostate, so alcohol should be prohibited.