By consulting ancient medical books on theory of nature of Chinese herb

the author makes confluence analysis on nature of Chinese herb based on analogy thinking guidance and finds that analogy thinking is widely used in theories of Chinese herb nature

including herb naming

four-nature & five-flavor

trend

channel tropism

toxicity

processing

etc. Herb naming based on analogy thinking includes naming by shape-properties

herb nature

flavor

function and growing environment. Four-nature & five-flavor includes determining by shape-properties

growth and substantial-function. Trend includes determining clear-turbidity-ascend-descend from Yin-yang

discussing ascenddescend from thin or thick flavor and determining the trend from shape-quality. Channel tropism includes channel tropism by shape

five-phase channel tropism theory and channel-collateral Zang-fu viscera tropism theory. Toxicity includes determining the toxicity from judging Yin-yang and four-nature

as well as explaining the toxicity from combining five-flavor. Processing includes processing consulting herb nature and flavor

as well as processing according to the nature of accessories. Based on three grades of image

sign and imagery

ancient physicians enrich the cognition of herb nature and form a dynamic Chinese herb nature system advocating the harmony between man and universe.