The inner corner of the eye is also known as the medial canthus, the appearance of the medial canthus in childhood usually does not require treatment, adult patients with medial canthus can be corrected through surgery. A medial canthus is a fold of skin in the shape of a half-moon that covers the vertical corner of the inner eye. The patient has no self-conscious symptoms, and it mainly affects aesthetics. In children, this condition does not require treatment because it can be gradually reduced or even disappear with age and the continuous development of the nasal bone structure. For adult patients with medial canthus, since the nasal bone and facial structure have already been developed, it can only be corrected through surgery, whose surgical methods mainly include “Z” molding, four-flap molding and “V-Y” molding. The “Z” shaping method is suitable for patients with mild medial canthus; four-flap plasty is suitable for patients with moderate or severe medial canthus as well as bilateral widening of the inner eye corners; “V-Y” shaping method is suitable for patients with severe medial canthus as well as bilateral widening of the inner eye corners. The “V-Y” method is used in more severe cases with bilateral widening of the inner canthus. Patients with inner eye canthus conditions are advised to go to a regular hospital for examination and choose the appropriate surgical method under the guidance of the doctor.