There are five main types of double eyelids: the first type is parallel. The double eyelids are basically parallel to the upper eyelid margin. The design of double eyelid lines should not exceed the outer corner of the eye. Suitable for women with big eyes, high eyebrow arch, eyebrows far from eyes and thin eyelids. The second is fan-shaped, which is also one of the classic double eyelids. It is similar to "peach eyes" and is deeply loved by young girls. It is characterized by narrow inside and wide outside, suitable for moderate eyebrow-eye spacing, thin eyelids, a certain angle between the horizontal axis of the eyes and the ground plane, and a slight upward lift of the corners of the eyes, which has a feeling of flying spirits and is very arrogant. The above two kinds of double eyelids account for more than 80%. The third category refers to the double eyelids which are slightly wider inside and narrower outside. Suitable for epicanthus without epicanthus, and the distance between eyebrows and eyes is relatively close, which is more common in western women. The fourth category refers to that one-third to one-half of the inner sides of the double eyelids are not paired, but only the outer parts are paired. This kind of double eyelids is very charming and sexy. The fifth category is the so-called "European eyes" double eyelids that many girls blindly want to do. Basically, they are only suitable for the skeletal structure of European face, which is also determined by the physiological and anatomical structure of eyelid meibomian. Moreover, their eyebrows are particularly high and very close to their eyes, so their double eyelids are often very wide and exaggerated. But this is not suitable for girls.