The medial canthus is a half-moon shaped webbed crease of skin that is located in front of the medial canthus in an oblique or vertical direction. Depending on the orientation and direction of the medial canthus, it can be classified as upper lid, medial canthus, or lower lid (also known as the inverted type). There are three degrees of canthus, depending on the degree to which the canthus covers the lacrimal mound: a mild degree covers less than 1/3 of the lacrimal mound, a moderate degree covers about 1/2 of the lacrimal mound, and a severe degree covers most or all of the lacrimal mound. The canthus is often accompanied by a widening of the inner canthus, but there are also some people who do not have a widening of the inner canthus. There are very many methods of correction of medial canthus (i.e., eye opening), each with its own advantages and disadvantages and different indications, but whether there are principles to follow in the management of different types of medial canthus has rarely been reported. Reviewing the cases from January 2012 to January 2014, we followed the protocol of treating different methods accordingly according to the morphology and degree of the medial canthus and the medial canthal spacing, and obtained good results. A presentation has been made at a national congress.