Latent pathogenic Qi theory traces to the source of Yellow Emperor’ s Inner Canon（ 黄帝内经）.After physicians of past generations developed the theory

until the late Qing Dynasty

a more complete theoretical system was formed.Inference to the best explanation is a principled explanation of non-proving reasoning.The core idea is that the reason of the explanation is to guide reasoning.Scientists infer hypotheses from available evidence.If the hypothesis is correct

it is the best explanation to the evidence.Logical deduction is made on the understanding process of latent pathogenic Qi theory forming by inference to the best explanation.It is explored that the consistency between the thinking mode of latent pathogenic Qi theory forming and the thinking of inference to the best explanation.The process of latent pathogenic Qi theory forming could be looked as the logical thinking process of inference to the best explanation.In addition

the explanation plays a leading role throughout the reasoning process.