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Fu is the hottest time of the year, with the highest temperature and the most full yang. As the saying goes, in full swing. It is divided into three parts: the beginning, the middle and the end, commonly known as three volts. The calculation of volts is determined according to the coordination of solar terms and the calendar of branches and branches.

There is a folk saying that "the summer solstice falls on the third Geng Xu", and Geng Xu refers to the seventh date representing heavenly dryness. Lodging refers to the first lodging from summer to the third Geng day in the future, lasting 10 days. The end of the day is 10 days from the first Geng day after beginning of autumn. The intermediate voltage refers to the time between the first and last voltage. Because it is calculated from the first and last volts, and the dates of the first and last volts are not fixed every year, the number of days in the middle volts varies from year to year, ranging from 10 to 20 days.