Some normal men have normal testicular development, but their penis is relatively short, although they can also erect and ejaculate, but often compared with friends of the same sex, feel their penis is small, and increased inferiority complex, some will cause psychosexual abnormalities, and even doubts about their sexual ability, directly affecting the normal performance of sexual function. There is a lack of scientific statistics on the proportion of men with short penis, but from the point of view of patients encountered in outpatient work, there are indeed a lot of such patients. Foreign literature reports, research found that the male penis is short mainly related to the following factors: 1, genetic factors: the penis and other organs of the body, its size and morphological characteristics to be controlled and influenced by genetic genes. 2, development and nutritional status: Generally speaking, adult men are physically fit, tall, their external genitalia, including the penis, scrotum development is also better, the penis may be thicker; conversely, it may be relatively small. But it must be reminded that the size of the penis is not proportional to the height, often seen in some men less than 1.60 meters tall, the penis can reach more than 16 cm when erect. 3, obese: some small abdomen, pubic symphysis, perineum fat plump prominent men, often penis development is poor, compared to the normal male penis will be relatively short, and patients themselves visually own penis difficulties, more think their penis is small. Indeed, compared with the hypertrophy of the body on the short side of the penis in marriage may bring some difficulties and undesirable sexual life. 4, other: such as endocrine disorders, male hormone levels are insufficient, the testicles or scrotum swelling of the penis “retraction”, etc., may cause penis short. The way to enlarge the penis: 1, increase the “volume” of the penis: penile corpus cavernosum and urethral corpus cavernosum volume increase, so that the length and diameter of the penis increased (including erect and weak state). At present, the more commonly used method is the implantation of autologous fat, but also the implantation of mesh stent. Some people also put “beads” (a polymer material) under the coronary sulcus to increase the “sexual” interest, this method is very popular in Korea. 2, surgery to lengthen the penis: because the penis body is not completely exposed outside the pubic bone, there is a long part of the pubic bone is not exposed, obese people are particularly obvious, medically known as occult penis. The purpose of surgery is to expose a small part of the penis that is not exposed again to achieve the purpose of growth. The suspensory ligament of the penis is located in front of the pubic bone and is the connection between the heel of the penis on the dorsal side and the pubic bone. By allowing the penile suspensory ligament to stretch to its maximum extent, the penis can be effectively grown. By removing the suspensory ligament of the penis, we can achieve the purpose of lengthening the penis of the patient, and the results of clinical observation so far can lengthen about 2cm after the surgery. The only disadvantage of removing the penile suspensory ligament is that the penis feels less stable, but it does not affect erection and sexual life. 3, In addition, penile erection also involves a series of complex biochemical processes such as G pheromone and hormone secretion. Adequate secretion of sex hormones helps the penis to develop, erect and last maximally, and it is important to maintain normal stability of sex hormones. Small penis associated with low hormone secretion before puberty can be lengthened and thickened with testosterone supplementation, however, hormone supplementation after puberty has no improvement on penile shape.