"Obtaining qi" and "qi arrival" are discussed in Yellow Emperor’s Inner Canon（ 黄帝内经） to clarify the effect of acupuncture. "Obtaining qi"emphasizes guarding health qi

which is different from "needling sensation"; "qi arrival" is judged by the pulse manifestation changes before and after needling

which is the key of effective needling. All kinds of techniques in needling are just "adjusting qi"based on "obtaining qi"

thus achieves the effect of "qi arrival". "Governing spirit"and "guarding spirit" between doctors and patients are the key in achieving the therapeutic effect of acupuncture.