When did the Chinese start to like double eyelids, why the ancient beauty are single eyelids?

Because the Han bloodline of some northern nomads fused, the once traditional concept of aesthetics changed.

In different dynasties, people for women's aesthetics are also different, for example, the Han Dynasty is more important to the face of the aesthetic, but the Tang Dynasty is more important to the body of the aesthetic, and in the aesthetic of the Tang Dynasty, they preferred wide forehead and full breasts, as well as a round face and a full-bodied figure. In the Song Dynasty, it was considered the highest standard for a woman to look elegant and sensual.

In ancient times, women's eyebrows were not like today's, on which they had to be painted with some male black pigment and shaved off to look good. Each era has each era's aesthetics, for example, in modern times, people are more favorable to the slim figure and double eyelids. But why were images of women in ancient times dominated by single eyelids? In fact, as far as we can see nowadays, it can also be concluded that people usually unconsciously painted portraits of people with factors such as long eyelashes and double eyelids because it was generally considered a symbol of beauty in this era.

Before the Wei, Jin, and North and South Dynasties, people did not take single eyelids as a symbol of beauty, but then some ethnic groups in the north entered the Central Plains and intermarried with the Han Chinese, who slowly took on some other genes, and the characteristics of the Han Chinese gradually began to change. So people's aesthetics have changed, and they generally believe that small eyes look more mysterious and charming, single eyelid merged phoenix eyes are the most beautiful.

Usually speaking, the characteristics that most people have will not necessarily become the trend of beauty, and a small number of people have will become the trend of beauty. Things are more valuable when they are rare. So if you want to know the aesthetics of an era, look at the images of women made by most of the painters of that era, because the authors usually paint to the standard of beauty they have in mind.

So it's perfectly normal for people's aesthetics to change according to the times.