Starting from daily life, this book, combined with Huangdi Neijing, tells people when to do it and when not to do it, and guides us to maintain our health according to the health law of human biological clock. Each chapter clearly analyzes the secrets of keeping in good health in time and timing, and corresponds the the twelve meridians of human body with twelve o'clock, which perfectly reveals the true meaning of keeping in good health in time medicine.

In December, there are twelve o'clock on the day, and there are gods in the internal organs. As long as we live according to the human nature every day, do the right things at the right time, eat well, sleep well, and support our innate truth, health will become very simple! This book is about using the health-preserving laws of human meridians to maintain the health of family members.