Midsummer is the middle month of summer, that is, the noon month built in December of the dry calendar, and also refers to May of the lunar calendar. Because it is in summer, it is called. In the afternoon, the fight is divided into the south, the hexagrams are divided, and the five elements belong to fire. At that time, it was the midsummer month, when everything grew and had great potential. According to folk custom, the summer sun is strong, which is the most vigorous day of Chinese medicine for flowers and trees in a year, and drugs are everywhere in summer; The principle supporting this popular belief is naturally based on a cosmological explanation: at noon on the Dragon Boat Festival or this day, due to the change of seasons, the sun is shining brightly, but at the same time, all kinds of herbs grow most luxuriantly. The ancients thought that pure anode health in midsummer, noon, noon, and noon, and three noon were the most important, which was regarded as the best way to drive away yin evil when the yang was in full swing. Koreans call midsummer Dragon Boat Festival "going to Japan", which means the day of God.