The skin folds in the inner corner of the eye that block the tear trough, or canthus, can be classified as congenital or acquired by cause; lid type, lid plate type, brow arch type, and lower lid type by anatomical cause; and mild, moderate, or severe by severity. The main surgical procedures used to improve the canthus are as follows: 1. Single “Z” surgery: the stallard method, which is suitable for mild congenital canthus and scarred canthus; 2. Double “Z” surgery This method is applicable to mild congenital canthus and striated scarring canthus; 2, double “Z” molding: simply by transposition of the surface flap to correct the canthus, the effect is unstable and not lasting; 3, Y-V molding: this method is suitable for mild narrow heel fissure, for the inner canthus is more appropriate; 4, Mustarde method: also known as “five flap method”, this method is a combination of “Y-V” molding and “Z” molding. This method is a combination of the principles of “Y-V” molding and “Z” molding, and is suitable for those with severe canthal redundancy or wide spacing between the canthus and small lid fissures; 5, V-W molding correction, also known as the Uchida method, this method is lacking in the formation of the canthus after surgery and affects the original shape of the orbital-nasal angle. In short, each type of canthoplasty has its own advantages and disadvantages, and the choice of any type of surgery must first be based on the principle of both correcting the canthus and reducing postoperative scarring.