Ancient and modern preparation methods of rhizoma gastrodiae are described in literature and provided the clues and basis for further research of craft and quantity standard of rhizoma gastrodiae.

RESULTS: The content of gastrodin of Rhizoma Gastrodiae processed by vacuum freeze drying was significantly higher than that by boil with water and oven drying.

Objective: Different pretreatment methods affecting purity and concentration of DNA extraction of Rhizoma Gastrodiae tuber were studied.