The extraction method of costal cartilage in nasal plastic surgery mainly depends on what kind of costal cartilage the doctor chooses to obtain. The seventh costal cartilage is generally preferred, because it is relatively straight and can obtain a length of 4 ~ 5 cm. The seventh rib is a floating rib, which can be touched. The surgical incision is located on the anterolateral side of the chest wall and is about 2cm long. Because the skin covering the ribs is movable, a longer costal cartilage can also be obtained through a relatively small incision. During the operation, the external muscle was stripped along the direction of muscle fiber to expose the deep rib, and the cartilage was stripped after a slight incision of the perichondrium. When peeling off the deep periosteum of costal cartilage, we should pay attention to avoid damaging pleura and causing pneumothorax. After determining the cutting length, cut the costal cartilage with the corresponding length.