1, Tomb-Sweeping Day is one of the twenty-four solar terms in the lunar calendar, which is at the turn of mid-spring and late spring, that is, 108 days after the winter solstice. The traditional Tomb-Sweeping Day of the Han nationality in China began in the Zhou Dynasty and has a history of more than 2,500 years. "Almanac": "On the fifteenth day after the vernal equinox, the bucket refers to Ding, which is used for Qingming, when everything is clean and bright, and when it is covered, everything is clean and bright, hence the name." As soon as Qingming comes, the temperature rises, which is a good time for spring ploughing and sowing, so there is a saying that "before and after Qingming, we plant melons and beans". Tomb-Sweeping Day is a festival to worship ancestors, and the traditional activity is to sweep graves. On May 20th, 2006, it was approved by the State Council to be included in the first batch of national intangible cultural heritage list.

2. Origin of festivals: Tomb-Sweeping Day is a traditional folk festival in China, and it is one of the eight important festivals (Shangyuan, Qingming, Long Summer, Dragon Boat Festival, Mid-Autumn Festival, Winter Solstice and New Year's Eve). Generally, it is around April 5th of Gregorian calendar, and the festival cycle is very long, including 8 days before 10 and 10. It is said that the origin of Tomb-Sweeping Day began with the supplement of "basic sacrifices" by ancient emperors. Later, people followed suit, and it became a fixed custom of the Chinese nation to worship ancestors and sweep graves on this day.