The famous Jin-Yuan dynasty Chinese physician ZHANG Yuansu inherits Inner Cannon of Huangdi

models himself after Zhang Zhongjing

absorbs the essence of many other physicians

perfects the Zang-fu differentiation theory

develops the six meridian differentiation system

and creates the Chinese herb property theory. ZHANG Yuansu combines the herb property with Zang-fu differentiation and meridian differentiation

and innovatively proposes Chinese herb channel tropism and guiding action theory

which contributes a lot to the establishment of Chinese herb tropism theoretical system.