The origin of Tomb-Sweeping Day is summarized in two or three sentences.

Tomb-Sweeping Day originated from the ancestral belief and the custom of worshipping spring in ancient times, which has both natural and humanistic connotations. It is both a natural solar term and a traditional festival. This is an important traditional Spring Festival, and the custom of sweeping graves to worship ancestors is still popular in Lingnan area.

Tomb-Sweeping Day is at the turn of mid-spring and late spring, that is, after the winter solstice 108. Grave-sweeping activities usually take place in Tomb-Sweeping Day 10 days before and 10 days after. In some places, grave-sweeping activities last for a month.

Tomb-Sweeping Day, also known as the outing festival, is at the turn of the vernal equinox and the end of spring, usually around April 5, after the vernal equinox 15 on the Gregorian calendar. It is one of the four traditional festivals in China.

Twenty-four solar terms are the climate laws formulated by ancient people according to the change of the earth's position on the ecliptic, which objectively reflect the changes of temperature, phenology and rainfall in four seasons and have indispensable guiding significance for people to arrange agricultural production activities on time.