The nature of the five-element theory is a complex system model. According to the evolution law

the five-element theory explains the interaction between the structures and functions within the complex system. In the five-element theory

each element contains the other four elements. This theory is a complex system model containing philosophical substance and function and five-element generation-inhibition. This model is used to explain a variety of phenomena in Chinese medicinal theory

such as the holistic pathogenesis rule of Six-meridian Diseases

the fiveflavor belonging of the five-element substance and function in Auxiliary Verse on Drugs and Methods for Zang-fu Organs（ 《辅行诀五脏用药法要》）. It is indicated that five-element substance and function model is formed based on the "simplest and applicable "principle. In addition

by using the substance and function philosophy

the fiveelement theory is a bridge that connects traditional Chinese medical theory and the modern systematic science.