Interpretation of “assessing quality by distinguishing TCMM features” and research ideas about commodity specifications Brief introduction of research methods of commodity specification and grade of Chinese medicinal materials Interpretation of “assessing quality by distinguishing TCMM features”and research ideas about commodity specifications Classification study on commodity specification and grade standard of Pseudostellariae Radix Qualitative characteristics and classification study on commodity specification and grade standard of Panax notoginseng Research model on commodity specification standard of radix Chinese materia medica