The average length of Chinese men’s penis is 12cm-16cm. Like height, the length of penis varies from person to person, generally speaking, a fully erected penis with a length of more than 8cm is considered normal, and it is also hard enough. Measurement of the penis, after the penis is fully erected, from the root of the penis pubic symphysis as the starting point of measurement, and the glans and urethra of the most anterior end as the end point of measurement, the length of the measurement is greater than 8cm even if the length of the normal length, there is no need to be through the drugs and surgery to treat and intervene. The hardness and duration of the penis are the main factors affecting the quality of sexual life, and the thickness and size of the penis are secondary. Daily should eat a light diet, maintain a good exercise habit, quit smoking and drinking, regular work and rest, avoid staying up late, keep a happy mood, can improve the quality of sex life.