The emergence of nine needles in Nèijīng（《内经》, The Inner Classic） laid a foundation for the formation and development of needling instruments and acupuncture manipulation in later ages, but the application of nine needles was not realized during clinical practice of acupuncture-moxibustion in later ages. Round-sharp needle is one of the nine needles. In this study, round-sharp needle was taken as an example to introduce the excavation and revitalization of nine needles and diagnosis and treatment rules explored by Mr. CHEN Lixin according to The Inner Classic. The needle shape, needling manipulation and clinical application of round-sharp needle based on The Inner Classic were described in detail.
