Generally speaking, in the Tang Dynasty, Li Shimin, Emperor Taizong, in order to conquer the northern Turks and pacify their repeated violations, let his general Li Jing personally lead the troops to station in the frontier fortress, and as a result, he repeatedly made outstanding achievements. On August 15, he returned to Beijing triumphantly. In order to celebrate the victory, guns were fired and music was played inside and outside Chang 'an, Kyoto, and the soldiers and civilians reveled all night. At that time, a Tubo went to Chang 'an to trade, and specially presented round cakes to the emperor to celebrate the victory. Li Shimin, Emperor Taizong, was overjoyed. He took a beautifully decorated cake box, took out colorful round cakes, pointed to the bright moon hanging in the sky and said, "Do you want to invite hamachi Hu cakes? The moon. " Subsequently, the round cakes were distributed to civil and military officials. Since then, the custom of eating moon cakes on Mid-Autumn Festival has been handed down.
The theory began in the Song Dynasty. In the Northern Song Dynasty, in Tokyo and Kyoto (now Kaifeng, Henan Province), on the night of Mid-Autumn Festival, people went upstairs to climb mountains, and when the moon rose, Yue Bai began. The offerings used include moon cakes, melons and fruits, cockscomb flowers, etc., but moon cakes are the main ones. Su Dongpo, a poet in the Song Dynasty, said: "Small cakes are like chewing the moon, crisp and full." The moon cakes at that time were very similar to those of today.
Today, we eat moon cakes in the Mid-Autumn Festival, not only to celebrate the harvest, but also to look forward to the reunion of relatives.