Why is the nose the most fragile? Experts say, because the nose is composed of bone, cartilage, connective tissue, elastic, nasal bone at the root of the nose, is a continuation of the skull protrusion, the upper part of the nasal bone is thick and narrow, relatively fixed, not easy to fracture, while the lower part is thin and wide, lamellar and more prominent, so it is easy to fracture and form a deformity. There is a wall in the middle of the nose called the nasal septum. The root of the septum is composed of bone, while the front part is composed of cartilage, once the fracture will bend the septum, the main manifestation after nasal trauma is local swelling, bruising and pain, and sick children often refuse to be examined. Connecting the bony part is cartilage and connective tissue, which is easily swollen and bruised after trauma. The following are the causes of nasal septum or cartilage exposure in the nasal cavity: Nasal bone fractures are mostly caused by trauma. When violence acts directly on a part of the bone and causes fracture of that part, the injured part is often fractured, often accompanied by varying degrees of soft tissue damage, such as violent impact, and nasal fracture occurs at the place of impact. Nasal fractures can occur alone or simultaneously with other jaw fractures. The external nose protrudes from the face and is susceptible to injury from impact, fall, gunshot and explosive shrapnel. External nasal trauma accounts for 50% of nasal trauma, with lacerations and nasal fractures being the most common. The type of fracture is related to the direction and size of the violence. External nasal trauma is often accompanied by septal trauma, with cartilage dislocation, bending, fracture, mucosal tear and septal perforation. Nasal bone fractures are often accompanied by septal fractures. Whenever nasal bleeding, nasal congestion or increased nasal congestion occurs after trauma, nasal septal palpation should be performed routinely, under adequate mucosal contraction and superficial anesthesia. On examination, nasal septum fracture should be highly suspected if there is mucosal rupture and hematoma formation in the nasal septum, and if the nasal septum is locally bulging. CT examination can clearly show the fracture site to guide the treatment. CT examination can clearly show the fracture site to guide the treatment. Different treatment plans should be taken according to the severity of the injury procedure and whether there is a compound injury. Displacement surgery is aimed at not affecting facial aesthetics, nasal ventilation, smell and other functions. To avoid external nasal deformity and nasal dysfunction and other sequelae, it is very necessary that the correct repositioning should be taken for the timing of nasal bone fracture rectification. 2-6h after injury is the golden time for simple nasal bone fracture, and with compound injury should be performed within 2 weeks after injury. Nasal bone fracture accompanied by nasal septum fracture, should first nasal bone repositioning surgery, especially the nasal bone fracture of the lower segment of the nasal cavity can be performed on both sides of the nasal cavity double joint after lifting upward reset, nasal septum fracture or misalignment regular meeting part of the correction, and then nasal septum repositioning or nasal septum correction surgery. It should be noted that the nasal septum should be in a neutral position when filling. Open wounds should be treated simultaneously with debridement and suturing and revision.