**6. Conclusions**

The research found 321 plant species belonging to 103 families and 253 genera that were used in the traditional medicine of the Tay ethnic group in Thai Nguyen province. In general, people preferred preparing medicine by boiling them in water for oral ingestion. The most used parts of plants were leaves and stems. The Tay ethnic people rely on herbal remedies for their basic health care, thus indigenous medicinal plant knowledge plays a vital role in solving local health care problems. Most of them had high use values, suggesting that they may produce bioactive compounds with strong physiological effects. That will provide basic data for further research as well as conservation of important medicinal plant including the endangered species in the study area.
