Grain Rain is the sixth solar term of the twenty-four solar terms and the last solar term in spring. Dou refers to Chen; the ecliptic longitude of the sun is 30°; the festival is held from April 19th to 21st in the Gregorian calendar every year. Grain rain is taken from the meaning of "rain produces a hundred grains". At this time, the precipitation increases significantly. The first seedlings and new crops in the fields need the moisture of rain. The rainfall is sufficient and timely, and the cereal crops can grow vigorously. Grain Rain, like the solar terms of rain, small full, light snow, heavy snow, etc., is a solar term that reflects the phenomenon of precipitation, and it is the reflection of the ancient farming culture on the seasons.