Firstly, the hyperplastic part was measured and marked with methylene blue. At the junction of lip mucosa and oral mucosa, the incision line is designed. In order to ensure the obvious lip bead of the upper lip and increase the aesthetic feeling after the thick lip thinning operation, the incision line should be designed as an arc, parallel to the arch edge of the upper lip, with a width of 4-6mm and a depth of less than 6mm. The longitudinal sections of the two incisions are at an angle of 70-90 degrees, and the two ends of the incisions can extend to the buccal side appropriately to avoid the appearance of "cat ears" in the quarrel and keep the shape of the quarrel natural.

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