Inner Canon of Yellow Emperor（ 《黄帝内经》） had a clear record of the running courses of nutrient qi and defensive qi

and the running courses of defensive qi could be classified as simultaneous running courses of nutrient qi and defensive qi and running courses of yang qi in the daytime and yin qi at night. The reason for different views was formed. On the one hand

it is the Huan Dao Theory（ 圜道观） leading and limiting the construction of the theory of running courses of nutrient qi and defensive qi which resulted in the form of the theory that the nutrient qi and defensive qi followed running course of channel. On the other hand

different facts of experience had also proposed new interpretation and requirements

which formed a situation in which different interpretations of the coexistence and contention of defensive qi. Judging from Popper’s theory of scientific development

such as speculation

rebuttal

speculation

and refutation

the explanation of the traditional Chinese medicine theory of running courses of nutrient qi and defensive qi is mostly a kind of speculation. There is no development process of rebuttal

speculation

and rebuttal. The lack of a highly self-consistent and highly integrated logic test is only a preliminary explanation of experience

or even a circular argument. It is far from meeting the requirements of relevance and testability of scientific interpretation

which needs further study and exploration.