There are several methods to increase testosterone: 1) exogenous supplementation of testosterone, the most commonly used drug for exogenous supplementation of testosterone is testosterone undecanoate, which can increase serum testosterone level by oral absorption, but not the level of testosterone in the testes; 2) aromatase inhibitors, mainly by inhibiting the activity of aromatase, preventing the conversion of testosterone to estradiol, thus increasing testosterone level, the most commonly used drugs are letrozole, anastrozole, etc.; 3) intramuscular injection of human chorionic gonadotropin, which can also increase serum testosterone level, mainly for patients with hypogonadism.