Reading the Outlaws of the Marsh to see how the Song Dynasty passed Tomb-Sweeping Day.

Tomb-Sweeping Day's grave sweeping and outing were originally two different cultural themes, which gradually merged after the Song Dynasty and were constantly endowed with positive cultural significance. People directly associate ancestor worship with the Chinese national character of attaching importance to filial piety and cautiously pursuing the future, and think that Tomb-Sweeping Day custom embodies the moral consciousness of China people who are grateful and never forget their roots. Its cultural significance is similar to Thanksgiving in the West.

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As one of the twenty-four solar terms, Qingming first appeared in Huainanzi Astronomy: "On the fifteenth day after the vernal equinox, fighting refers to Qingming." Holidays began in Tomb-Sweeping Day in the Tang Dynasty, and there are four to seven days' holidays in different years. Song Dynasty is an era of increasingly urbanized life and the development of folk customs in the direction of entertainment. In order to allow people to sweep graves and go hiking in Tomb-Sweeping Day, it is specially stipulated that imperial academy will have a three-day holiday and the martial arts school will have a day off. Now Tomb-Sweeping Day has become a national festival in China.

Du Mu's poem "It rains a lot during the Qingming Festival, and pedestrians on the road want to break their souls" gives the best interpretation of the old saying "Qingming is rare".