The authors introduce Professor CHENG Xinnong’s experiences in meridian tropism differentiation and diagnosis in acupuncture clinical practice. According to that disease at different channels and collaterals manifest lesions at different running course part of channels and dysfunction of Zang-fu viscera belongs to different channels

Prof. CHENG proposed running course of channel and meridian tropism differentiation theory

which means that according to the running course of channel and connecting Zang-fu viscera

patients’ symptom and sign were analyzed and summarized

then the disease and syndrome of certain meridian or certain meridian connecting Zang-fu viscera were determined. using meridian to guide points

and applying proper reinforcing and reducing techniques. Meanwhile

internal and external correspondence

considering the upper and lower parts

combined with Zang-fu viscera syndrome differentiation and other methods

correct meridian tropism diagnose and point-selection could be made.