China people are longitudinal depressions located in the middle of the lip and below the columella, with shallow upper part and deep lower part. The ridges on both sides of the depression are ethnic ridges. The ridges on both sides are roughly parallel, but the upper plane is narrow and the lower plane is slightly wider. Man is an important surface structure in the center of the upper lip, and the flat upper lip lacks three-dimensional sense, which makes the upper lip appear stiff.