Supracondylar fractures of the humerus are fractures that occur 2-3 cm above the inner and outer condyles of the distal humerus. Epidemiological studies show that supracondylar fractures of the humerus are the most common fractures in children, accounting for about 3% to 7% of pediatric extremity fractures and 30% to 40% of elbow fractures, with the extension type accounting for about 90%. The incidence of supracondylar fractures of the humerus in children is significantly associated with the season and climate: as the temperature rises, the incidence increases significantly starting from April and reaches its peak in July and August. Due to the special anatomical characteristics of the elbow, the important blood vessels and nerves of the upper extremity are gathered here, and the displaced fracture end and the accompanying local tissue edema are very likely to cause nerve and blood vessel injury. Pediatric orthopedic experts point out that in daily life, once the child falls, swelling around the elbow joint, pain, elbow joint can not move, the family needs to be highly alert, first of all, to check whether there is local skin damage, bleeding, if there is a timely clean bandage, and then give the child’s elbow joint temporary fixation, to prevent the fracture end of the movement to increase the child’s pain, promptly sent to the doctor.