OBJECTIVETo probe into essence and concept of Meridian, and discuss with the author of the paper "A new way for study of Meridian essence".

METHODSReview courses of studies on Meridian and collaterals in the half century, and look up and analyze the literature.

CONCLUSIONTheories of Meridian and Collaterals originate from Yin and Shang Dynasties, and are perfected in two Han Dynasties. Explaining the linking interiorly with zang- and fu-organs in the theories of Meridian and collaterals by means of modern anatomical physiology is inheriting the regulative theory of the urinary Bladder Channel of the Foot-Taiyang--the vegetative nerve.