Reinforcing and reducing manipulation is the elite of traditional acupuncture needling methods.Abundant records could be found in Neijing(The Yellow Emperor's Inner Canon)and Nanjing(The Classic on Medical Problems)at early times.In the present paper

the author collates and compares the recordation of reinforcing and reducing acupuncture manipulation in these two classics on the basis of the principle and connotation of the two manipulations and from three key factors as stimulus location

manipulation technique and needling time.Based on objective analysis of the original text

distinct differences were found in above three aspects.Therefore

the conclusion is that Neijing and Nanjingresemble different medical school of thoughts at an early phase of acupuncture theories.