Empress Wu Zetian and imperial concubine Yang Yuhuan, who stood out in the real life of the Tang Dynasty, can be called "rich and beautiful, gentle and pleasant" models. Wu Zetian, the only female emperor in China history, stepped into the peak of power with her beauty, wisdom and courage. Although there was no camera or painting to record her true face at that time, from the description of "square forehead, wide eyes and phoenix neck" in the history books, we can draw the conclusion that she won the status of "obsequious mother" with her broad forehead, plump cheeks, round overlapping neck and rich image, thus laying the foundation for her to be closer to the power center. Yang Yuhuan, one of the four beauties in ancient China, is a well-known and eternal model of fat beauty. However, we have the same regrets as Wu Zetian. We can only imagine the beauty of her "as long as she turns her head and smiles, there will be a hundred spells, and the powder and paint in the sixth palace will go up in smoke", and infer her charming demeanor from the historical fact that "the emperor gave up his early hearing". "Being fat and being thin" summarized different aesthetic standards in Han and Tang Dynasties, and also fixed the beautiful form of "wealth and beauty" in Yang Yuhuan. Obviously, both works of art and real life clearly reflect that the Tang people really advocate "fat beauty and gentleness". This is different from the implicit and restrained aesthetics of my fair lady in Han Dynasty and most ancient times, and formed an "alternative" aesthetic vision in Tang Dynasty. And this kind of "otherness" and charm contrary to the traditional plump beauty are not only inferior to the traditional slimness and skinny feeling, but also more vital and energetic. In fact, after a little analysis, we will find that the "alternative" aesthetics of the Tang people is an inevitable feature of that heyday. First of all, in the prosperous Tang Dynasty, there was plenty of food and clothing, just as the poet Du Fu wrote, "Rice is fat and white, and public and private warehouses are rich." People have the conditions to eat and wear warm clothes and keep healthy and plump physique. Secondly, the Tang Dynasty was open and tolerant. Strong national strength and developed civilization have made the Tang people confident and become a highly open country. According to incomplete statistics, there were more than 130 countries related to the Tang Dynasty at that time. Influenced and blended by different cultures, Tang people are not limited to tradition, but have a broad vision and enthusiasm. Third, the lineage of the rulers also determines that the Tang people are closer to their strong bodies. The grandfather of Li Yuan, the founding emperor of the Tang Dynasty, was big noble Dugu. He hoped to be born in Xianbei. In other words, at least half of Li Tang's royal blood is Xianbei people, and the nomadic life of Xianbei people creates and needs a wild and strong body. Therefore, it is not difficult to understand that several generations of emperors in the Tang Dynasty loved fat women.