After free flap surgery on the finger, the interior is not entirely scarred, but also has subcutaneous tissue and capillaries. Finger free flap transplantation is to promote the restoration of normal function of the damaged area, although for the damaged area of the free flap transplantation, but the existence of the transplanted area needs tissue and blood supply, so after free flap surgery its internal is not all scar tissue. Subcutaneous tissue and capillaries are mainly located in the middle part of the free flap graft area, mainly because of the anastomotic growth between the grafted part and the recipient area; while a small amount of scar healing may exist at the edge of the free flap graft, mainly because of the involvement of fibrous tissues in the healing process at the edge of the trauma, which results in the formation of scar tissue.