Based on extra channel theory

Chinese medicine master ZHU Liangchun established the principle of"tonifying kidney

strengthening Du meridian

eliminating Bi and dredging channels"to treat Bi-syndrome. The origin development of this principle was summarized into "originating from Inner Canon of Huangdi and Classic on Medical Problems

learning from Li Shizhen

and following Ye Tianshi; tonifying kidney and Du meridian are as the root

dredging the meridians for the manifestation". As for etiology and pathogenesis

he emphasized body-resistance weakened while pathogenic factors prevailing

taking Du meridian as the entry point

and building the layering theory of"kidney-Du meridian-channels". It means that

the root cause is in kidney and Du meridian

including liver and kidney deficiency and / or Yang deficiency in kidney and Du meridian

while the manifestation is in channels

which refers to stagnation of channels and the malnutrition of bones and tendons. In treatment

ZHU Liangchun promoted the principle of treating Bi-syndrome with tonifying kidney

strengthening Du meridian

eliminating Bi and dredging channels. This principle is analogous to Ye Tianshi’s dredging and tonifying extra channels.