According to the direction and distribution of muscle fibers, the nasal muscle can be divided into three parts: transverse part, wing part and base part; when cleft lip occurs, the base part is missing, but the transverse part and wing part still exist, but the starting point is displaced outward and backward, and the muscle fibers are curled up on the lateral periosteum of the cleft edge, and the muscle fibers are slightly dense and not neatly arranged. 1, the transverse part of the nasal muscle: transverse muscle fibers start from the maxillary incisive fossa above, the most lateral muscle bundle of the nasal muscle, a small part of the upper lip nasal wing muscle fibers are also involved in its formation, muscle fibers issued around the base of the nasal wing, along the lateral side of the nasal wing to the upper dorsal side, muscle bundle in the dorsal part of the nasal wing is fan-shaped, and by thinning to the middle of the nasal dorsum to move into the tendon membrane, and converge with the opposite side. In addition to a few muscle fibers along the way into the skin around the nasal sulcus, there are still a small number of muscle fibers involved in the pterygoid muscle bundle, the upper part of its tendon membrane and its muscle fibers in the nasal dorsum and descending interbrow muscle intertwined. 2.Pterygoid muscle: The pterygoid part is located on the inner side of the transverse part, travels upward and outward, attaches to the front of the lateral foot of the lower lateral cartilage and the skin of the nasal wing, and intertwines with the fibers of the anterior group of nasal aperture muscle, pulling this muscle attachment can make the nasal wing abduct and open the nostril. 3, the base of the nasal muscle: The base starts from the middle of the incisive fossa of the upper jaw bone and is adjacent to the pterygoid muscle bundle. The muscle fibers pass through the orbicularis oris profundus and are distributed upward in the skin of the nasal aperture base, and some fibers stop at the lateral accessory cartilage of the inferior lateral cartilage, which has the role of stabilizing the connection between the accessory cartilage and the pear-shaped foramen, and may participate in the formation of the “nasal threshold” structure of the nasal aperture base. The nasal muscular system is surrounded by fascial-like fibrous tissue and is intertwined, overlapping and/or intersecting, which provides an anatomical basis for a balanced distribution of forces between the facial and nasal muscular systems, and for the synergistic action of the muscles. Often, the eventual movement of the nasal tip, nasal wings, and nasal dorsum are the result of synergistic muscle action. For example, the synergistic action of the supraspinatus, supraspinatus and descending septum muscles can greatly compress the nasal tip caudally, gathering the superior nasal lobule, lengthening the nose and presenting a “downward projection” of the nasal tip. In correcting these deformities, surgical excision of the overactive nasal muscles is required to stabilize the nasal tip.