2, the name of the Qingming Festival is related to the characteristics of the weather and weather conditions at this time. Western Han Dynasty "Huainanzi - astronomy training" said: "15 days after the vernal equinox, the bucket refers to B, then the Qingming wind to." "Qingming wind" means fresh and clean wind. The "Hundred Questions on the Time of the Year" says, "Everything grows at this time, all clean and clear. Therefore, it is called Qingming." Although the festival of Qingming in the Tang Dynasty was formed, but as a sign of the seasonal Qingming Festival has long been recognized by the ancients, the Han Dynasty has been clearly documented.