Traditional Chinese medicine is the treasure of the Chinese nation. We should inherit and promote the cause of traditional Chinese medicine in our country. There are not only many kinds of traditional Chinese medicine, but also different ingredients in each medicine. The content of different kinds of ingredients in the same medicine will be different. The same kind of effective ingredients are also affected by the origin, cultivation methods, production environment, etc. Therefore, the study of traditional Chinese medicine is an arduous and important task.

Standard and reference materials refer to the reference materials used for drug identification, inspection and content determination, that is, the materials with certain characteristics or quantities used in drug standards for the assignment, qualitative, evaluation and determination methods of the tested drugs or the calibration of instruments and equipment, in which the reference materials refer to the reference materials used for bioassay, antibiotic or biochemical drug content or potency determination.