What Tomb-Sweeping Day eats and the origin of Tomb-Sweeping Day eating cold food.

Traditionally, on this day, people are forbidden to make a fire, and they can only eat cooked food and cold food prepared in advance, that is, cold food is the main food to commemorate the' pushing intermediary' to send grief, which later became a custom. Later, it became a custom. In the development of later generations, it gradually increased the customs of sweeping, climbing, swinging, cuju, hooking hands and fighting eggs, which was handed down and was once called the biggest folk festival.