OBJECTIVETo study rules of distribution of channels and collaterals in external connection with orifices and limbs.

METHODSBased on classical theories in The Yellow Emperor's Internal Calssic and Classic on Medical Problem, summarization was carried out.

RESULTSThere are their own steric-crossed distribution of channels and collaterals on orifices and limbs, which is called as rules of distribution field of channels and collaterals.

CONCLUSIONThe study on rules of distribution field of channels and collaterals can guide treatment based on syndrome differentiation, and promote development of theories of channels and collaterals.