Soft tissue dilation is a procedure in which an expander is implanted under the normal skin, and the volume of the expander is increased by injecting fluid into the expansion capsule, which creates an expansion force on the surface skin deep in the skin tissue, causing the skin area to be expanded and promoting skin proliferation, thus obtaining “extra” skin area and using the newly added skin for tissue repair and organ A method of tissue repair and organ reconstruction using the newly added skin. The medical application of the principle of skin soft tissue expansion began with Dr. Radovan, an American plastic surgeon, who reported in 1982 in the American Journal of Plastic Surgery on 58 clinical cases of breast reconstruction after mastectomy using the skin expander technique. In the following decades, as basic research continued to deepen and the scope of clinical application broadened, it became a new, safe and effective method of plastic surgery that could be widely used. The application of skin dilatation is a milestone in the history of plastic surgery. Skin expander technology has become one of the conventional treatment tools, widely used in the repair of body surface scar, hemangioma, pigmented nevus and other post-excision wounds, especially in the head, such as scarring baldness, cranial exostosis and other treatment, due to the expansion of the skin color, texture, structure, the uniformity of hair to match the recipient area, and retain the sensory nerve, is the most ideal effect of the current means of repair.