Indications: 1, adult men are required, and generally hospitals also require married men. 2, most of the penis is defective, the length when erect is generally only 3 to 5 cm, according to the conventional for penile reconstruction surgery, and the reconstructed penis currently does not have normal erection and sensory function. If the penile cavernous extension is used, the superficial and deep ligaments of the penis are cut to the pubic arch, so that the cavernous body buried in front of the pubic symphysis becomes a free part, thus increasing the effective length of the penis, and the trauma after the cavernous body is extended is repaired with an inguinal island flap. This procedure not only extends the penis to near normal length, but also has normal erectile and sensory functions. 3, congenital ectopic deformity of the penis, according to the condition, penile lengthening surgery is used to lengthen and reset the penis. 4.When the small penis is erect, its length and circumference are between 5 and 8 cm, and the volume of testicles is more than 6 ml, penile lengthening is done at the same time as penile thickening, which is conducive to the morphology of the penis approaching normal. 5. For penile venous impotence, a penile lengthening operation at the same time as a ligation of the superficial dorsal penile vein can often achieve better results. Surgical methods: I. Autologous fat injection for enlargement: This procedure is the same as other autologous fat injections, which are performed by suctioning out one’s own fat and then injecting it into the penis. The fat used is generally the subcutaneous fat of the abdomen. Second, the dermal fat flap free transplantation enlargement: this is currently considered a better way, it is in a part of the body, such as the side of the chest abdomen, buttocks under the groove, etc. to take dermal fat flap, will be free transplanted to the penis, to achieve the purpose of thickening. Recovery and care after surgery: Autologous fat injection can be done as an outpatient procedure, and there may be exudate at the fat aspiration site for 3 days after surgery, which needs to be changed. Work and life are generally not affected after surgery. Dermal fat flap free grafting requires hospitalization to do the surgery, and the stitches should be removed 7 to 10 days after the surgery, and sexual life should be prohibited for more than 3 months after the surgery. Factors related to penis enlargement: 1, penis enlargement and genetic factors The penis is the same as other organs of the body, and its size and morphological characteristics are subject to the control and influence of genetic genes. 2, penis enlargement and 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, and vice versa may be smaller, but it is worth pointing out that the size of the penis is not proportional to the height, you can often see some men who are less than 1.60 meters tall, their penis can reach more than 18 cm when erect. The penis can reach more than 18 cm when erect. 3, penis enlargement and obesity also have some relationship, some small abdomen, pubic symphysis, perineum fat prominence of the male, often penis development is poor, compared to the normal male penis will be relatively short. Indeed, compared with the fat body, this short penis may bring some difficulties and undesirable sexual life after marriage. 4, penis enlargement is also related to other aspects, such as endocrine disorders, insufficient male hormone levels, penile retraction produced by swelling of the scrotum or scrotum, etc., which may cause penis shortening.