1, March 3 on the lunar calendar is the Festival. On the Si (sì) Festival, commonly known as the third of March, is a traditional festival of the Han Chinese people, the festival in the Han Dynasty before the first half of March Si Day, later fixed in the summer calendar on the third day of March. The festival is held in ancient times "purification bath" activities in the most important festival, people go to the water bathing, known as "Purification of Purification of purification", and since then has increased the rituals and banquets, goblets, the countryside in the spring and other content.

2, the ancient times to "dry" date, the first of the first half of March, the first Si day, called "on the Si". The word "on the Si" was first included in the early Han literature, "Zhou Li" Zheng Xuan note: "years of purification, now March on the Si such as water and so on." After the Wei and Jin dynasties, the festival period changed to the third day of the third month of the lunar calendar, it is also known as "heavy three" or "March 3".

3, on the Si Festival has its origins in the orchid soup to ward off evil witchcraft activities, said the orchid soup to drive away evil. Orchid was used as a spirit, has the characteristics of the aroma, the ancients in the major ceremonies held before the gods, must be fasting, including the best way to bathe at that time, "orchid soup bath".