When you go to Tomb-Sweeping Day, people with a little knowledge of history will associate it with the historical figure meson tui. According to historical records, in the Spring and Autumn Period more than 2, years ago, Zhong Er, the son of the State of Jin, fled and lived a hard life. The meson who followed him cut a piece of meat from his leg to satisfy his hunger. Later, Zhong Er returned to the State of Jin and became a monarch (namely Jin Wengong, one of the five tyrants in the Spring and Autumn Period). He rewarded all his followers who followed him in exile, but Jietui refused to accept the reward. He took his mother to Mianshan in seclusion and refused to come out. Jin Wengong could do nothing but let Yamakaji go. He thought that Jietui was filial to his mother and would definitely come out with her. Who knows that this fire burned the meson mother and son to death. In memory of meson tui, Jin Wengong ordered that on this day every year, no fire should be lit, and every household can only eat cold food, which is the origin of the Cold Food Festival. The Cold Food Festival is the day before Tomb-Sweeping Day. The ancients often extended the activities of the Cold Food Festival to Qingming. Over time, people combined cold food with Qingming. Now, Tomb-Sweeping Day has replaced the Cold Food Festival, and the custom of worshipping mesons has become the custom of sweeping graves at Qingming Festival. There is another saying: the ancients had the custom of welcoming spring. The weather in early March of the lunar calendar is just when spring is full, which is suitable for people to carry out all kinds of activities, including outing and even "sexual intercourse", so the most important festival in spring is also at this time. Zhu Xuqiang believes that the early Tomb-Sweeping Day did not have the function of offering sacrifices to sweep, and the activities in Tomb-Sweeping Day were the same as other festivals in early March. As we know, Qingming is one of the 24 solar terms, which are based on the solar calendar.