For the plastic surgery of nostril stenosis, the operation is to remove the scar in nostril, repair the wound, rebuild the channel and give consideration to aesthetics. The surgical method also depends on the degree of nostril stenosis: for mild nostril stenosis, nasolabial groove flap is used to remove scars; For moderate nostril stenosis with membranous scar, four-arc flap method can be used; If the scar is wide and the wound is large, skin grafting can be used.