Peng Zi-yi's academic views on six meridians in Treatise on Cold Damage Diseases; can be summarized as follows: Six meridians are transformed by six vital substances in human body; six meridians are an organic whole consisting of Zang-Fu organs,meridians and collaterals and gasification. The body superficial is the superficial of six meridians,which belongs to yingfen and weifen,and is the general name of the twelve meridians and meridian qi. The body interior is the interior of the six meridians,each of which has zang-fu organs. The half ext...