The philosophy of traditional Chinese medicine advocates that people's living habits should conform to the laws of nature, so the twelve earthly branches are regarded as daily rhythms to illustrate the ups and downs of yin and yang and the ups and downs of human meridians day and night, that is, the twelve hours of each day correspond to the the twelve meridians of the human body, which is interlocking and very orderly. On this basis, a good lifestyle is combined with regular work and rest time, and a 12-hour regimen is formulated.

Twelve-hour regimen is an important method in TCM regimen, which fully embodies the idea that TCM regimen pays attention to the unity of heaven, earth and man, decrypts the magical connection between human health and nature with the wisdom of ancient Chinese medicine, and reveals the health code hidden in time. As early as 2000 years ago, Huangdi Neijing, a classic of Chinese medicine, laid its theoretical foundation. The book records in detail the theories about the correspondence between man and nature, the circulation of meridians and qi and blood, and the waiting time of acupuncture and moxibustion, combining the characteristics of yin and yang, five elements, the law of trunk and branch and twelve zang-fu organs.