The best time to replenish qi and blood is winter. Winter is cold outside, which is ideal for storing energy in the body, including blood-building substances, including nourishing the middle energy, so that the body can accumulate energy to be evaporated when it is hot, that is, in spring and summer. Winter is suitable for refrigeration and also for nourishing the body, especially for the kidneys and spleen. For qi and blood, summer and spring are the seasons for evaporation, while autumn and winter are suitable for nourishment, and winter is the best. Many diseases should be treated in summer and winter, especially some diseases have different seasonal characteristics in different seasons, and the best for nourishing qi and blood is to nourish the kidneys in winter.