"Unity of Heaven and Man" is the fundamental feature of holistic thinking. The so-called holistic thinking is the way of thinking about the world and everything from the viewpoint of universal connection and mutual restriction. This way of thinking not only regards the whole world as a big organic whole, everything in the world is continuous and inseparable, and things are interrelated and mutually restricted, but also regards all parts of everything as a small organic whole, some of which are components of the whole, and the whole itself is a continuous and inseparable whole, and some of them are generally related to various factors and components. It is believed that heaven and man, things and things are homologous, isomorphic, in the same order and in the same way.

China's traditional philosophy, whether Confucian or Taoist, emphasizes holistic thinking. In the long-term medical practice, Neijing makes the overall thinking of traditional philosophy concrete and scientific.

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The human body itself is an organic whole.

Neijing regards the human body itself as an organic whole, and all parts of the human body are continuous and inseparable, and they restrict and interact with each other. Neijing attributed the organic connection of all parts and elements (subsystems) of the whole system of human life activities to three modes: the unity of opposites of Yin and Yang, the interference of five elements and the rise and fall of Qi.

Yin-Yang model shows that human life activities are composed of two physiological functional structures, which are interrelated, opposed, restricted and transformed. The five-element model shows that the functional activities of the five internal organs are an organic system with multi-level and multi-channel feedback. The ascending and descending pattern of Qi shows that people not only exchange material, energy and information with nature, but also transform the material, energy and information inside the human body through exercise.