The Tang Dynasty was an open society that allowed bare breasts and arms. The female body beauty advocated was a wide forehead, a round face, and a fat body. People in the Tang Dynasty were "rich, plump and lively," and considered fat as beauty, which is recognized by the world. The most beautiful woman in the Tang Dynasty, Yang Guifei, was very plump. According to unofficial historical research, Yang Guifei was 1.64 meters tall and weighed 138 kilograms. It is also said that Yang Guifei was 1.55 meters tall and weighed 120 kilograms. However, it is still unclear how fat Yang Guifei was. According to research, only traces can be found in Tang Dynasty poetry, calligraphy and painting, sculptures, pottery figurines and various works of art. For example, the "Picture of the Imperial Concubine Leaving the Bath" painted by the Tang Dynasty left a lasting impression on future generations. In addition, the origin of the idiom "the ring is fat and the swallow is thin" is also inextricably linked to Yang Guifei. Yang Yuhuan, the imperial concubine of Emperor Xuanzong of the Tang Dynasty, was plump, and Zhao Feiyan, the empress of Emperor Cheng of the Han Dynasty, was thin. The fatness and thinness of these two famous beauties in history were used by Mr. Su Shi to compare the styles of calligraphy works. According to Su Shi's "Sun Xin Lao Qiu Mo's Wonderful Poems" said: "Du Ling's commentaries are thin and hard. I don't believe this opinion. Short, long, fat and thin have their own styles. Who dares to hate the thin jade ring." The fat and thin nature of beauty. It's thousands of miles away from calligraphy, but it's actually connected by Mr. Su. It's really unique. Since then, the idiom "the ring is fat and the swallow is thin" has been spread, but gradually it has nothing to do with calligraphy and has returned to its most original meaning, which refers to a woman's figure. There is also Bai Juyi's "Song of Everlasting Sorrow". Although there is not much description of whether Yang Guifei is fat or not, the sentence "the hot spring water washes away the fat" can make people appreciate Yang Guifei's plumpness from the lines. Zhou Fang's "Lady with Hairpins" is known as the "symbol of women in the Tang Dynasty", and the strength and beauty of women in the Tang Dynasty, like a flower blooming freely, nourished the hearts of countless people in the Tang Dynasty freshly and fully. Eye. Moreover, in the Tang Dynasty, not only women were fat, but men were also fat. Concubine Yang’s godson An Lushan was one of them. According to the "Old Book of Tang Dynasty: Biography of An Lushan": "Lushan became more obese in his later years, and his abdomen hung down past his knees. It weighs three hundred and thirty kilograms... Xuanzong's previous work "Hu Xuan Wu" was as fast as the wind. "It weighs three hundred and thirty kilograms, but it is incredible that he can dance as fast as the wind in "Hu Xuan Wu". What is even more puzzling is: Why do people in the Tang Dynasty regard fatness as beauty? Why is the plump Yang Guifei so favored? The Tang Dynasty was a wealthy dynasty. Du Fu wrote in a poem that "the rice is dripping with fat and the corn is white, and the public and private barns are both abundant." The country was prosperous and people had enough food and clothing. The external condition of being fat also maintains a healthy and plump physique. The beauty of "Huanfei" flourished in the prosperous Tang Dynasty and originated from the north. The maternal grandfather of Li Yuan, the founding emperor of the Tang Dynasty, was Dugu Ruyuan, a great Xianbei noble. At least half of the Li and Tang royal families were of Xianbei origin. The Li and Tang royal families were founded by the Guanlong military group of the Xianbei nomadic tribe and took over the Central Plains. Some habits in life include admiring peonies, loving fat-butted horses, and advocating the beauty of stoutness. The nomadic life of the Xianbei people requires a strong and strong body. It is not surprising that the plump Yang Guifei is popular and favored. Besides, the people of the Tang Dynasty were confident and worry-free. The Tang Dynasty at that time was a highly open country, communicating with more than 130 countries. Chang'an City in the Tang Dynasty was a majestic capital city. It was the largest city in the world at that time and the center of Eastern civilization, attracting thousands of businessmen, travelers, scholars and religious believers of different faiths from all over the world. For example, Persia had close exchanges with the Tang Dynasty, and there were a large number of Persians living in Chang'an City in the Tang Dynasty. With the influx of people from the Western Regions, the lifestyle in Chang'an City has also changed, and imitating "Hu people" has become fashionable. For example, in terms of clothing, Chang'an was deeply influenced by the customs of the Western Regions. People from as far away as Persia and Tocharo, and as close as Turks, Tuyuhun and Tubo were all imitated by the Tang Dynasty. People in the Western Regions are relatively big, so it is estimated that the Tang Dynasty's "fatness is beauty" is also related to this