Tibet medicinal plants idioplasm resources and the distribution in Gannan state were studied through investigation of the literature consult,specimen gathering and on-the-spot.The results showed that there were altogether 88 families,299 genera and 625 species about the Tibet medicine plant idioplasm resources type in Gannan state.They mainly distributed in four geographical distribution areas,which were in the west,the middle eastern and north high canyon southeast.And most of the plant species was of high health care value and economic value.