Abstract: Male late鄄onset hypogonadism（LOH）is a clinical and biochemical syndrome which is age鄄
associated with typically clinical symptoms and a deficiency in serum testosterone levels—lower than the
recommend extent of healthy young adult males. Testosterone deficiency takes an important role in its
pathogenesis. Testosterone deficiency is an significant factor which induces sexual dysfunction. Testosterone
supplementary treatment（TST）can improve sexual function of patients with LOH in an extent.

Key words: Man, Age factors, Hypogonadism, Sexual dysfunction, physiological, Testosterone, Androgens