To talk about Tomb-Sweeping Day, we need to start with a lost festival-Cold Food Festival.

The Cold Food Festival, also known as the Hot Food Festival, the No-smoking Festival and the Cold Food Festival, is only one or two days away from the winter solstice 108. The main festival custom of this festival is to ban fire, cook without fire, and only eat prepared hot food and cold food, hence the name.

It is said that the origin of Tomb-Sweeping Day began with the "grave-sweeping" ceremony of ancient emperors and generals. Later, people followed suit, and it became a fixed custom of the Chinese nation to worship ancestors and sweep graves on this day.