Penis length counts the glans. The penis can be divided into the head of the penis, the body of the penis, and the root of the penis. The glans belongs to the head of the penis and should be added to the measurement when performing penis length measurement. The correct way to measure the penis is to use a straightedge and measure the total length from the end of the penis at the pubic symphysis position to the tip of the penis. To circumvent measurement errors, the position of the penis should be kept as constant as possible. At the same time, in case of phimosis, the foreskin should be flipped to the back of the glans. Penile length is divided into the length of the soft state and the length of the erect state, the average length of the adult male in the soft state is 6 ~ 8cm. clinically the erect length of the penis is used to stretch the length of the penis, the average length of the erect penis of the Chinese adult male is 10 ~ 12cm, but higher or lower than the average value of 2 ~ 3cm is normal.