To study the methods of grade classification in Gastrodia elata pieces.The combined traditional and modern methods were used to evaluate G. elata pieces comprehensively based on the study of documents & origin investigation
and then classify the grade. According to the investigation
there have not been the grade of G. elata Bl. pieces but the one of G. elata materials. The same situation is also appeared in enterprises
hospitals and drugstore.There are only two grades of G. elata Bl. pieces. One is the first
and the other is the commom. The processing pieces grade is only for G. elata growed in winter. It is good for improving the quality of G. elata.pieces and achieving the aim ‘high quality with high price’ according to classify the grade comprehensively. This study can provide ideas and reference for other similar study on Chinese herbal pieces.