The principle of normal men’s erection is through the sexual stimulation of erection, the whole body multi-system joint coordination to complete. Penile erection is mainly the effect of multiple factors such as neuroendocrine regulation and hemodynamic changes as well as cardiac effects. Penile erection is mainly a process of corpus cavernosum congestion under neurovascular regulation, and the balance between arterial inflow and venous outflow determines the degree of erection. Erectile dysfunction patients can take some drugs to promote penile erection. Commonly used drugs are sildenafil tablets and tadalafil tablets, which can improve blood circulation in the cavernous body of the penis, increase the hardness of erection, and promote rapid erection. The drugs need to be used as prescribed by the doctor. Normally, you should do more physical exercise to improve physical strength and enhance male sexual function. Do not be shy to seek medical treatment for erection problems, it is recommended to seek medical treatment as soon as possible.