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The flora at Tan Trao historical site, Tuyen Quang province is quite rich and varied. Initially, there were 726 species, 462 genera, 137 families, belonging to 6 vascular plant species. Among them, Magnoliophyta has the largest number of 669 species (accounting for 92.15%), 427 (accounting for 92.42%) and 115 families (accounting for 83.94%). Followed by the Polypodiophyta with 39 species (5.37%), 25 genera (5.41%), 13 families (9.49%). Psilotophyta, Lycopodiophyta, Equisetophyta, Pinophyta are the rest. The Magnoliophyta is the most diversified, with 5.82 species per family and 3.71 families per family. The survival spectrum of the Tan Trao historical flora was determined as SB = 73.55 Ph + 3.17 Ch + 9.78 He + 8.40 Cr + 5.10 Th. For the value of use, medicinal plants have the most abundant species with 470 species, timber trees have 188 species, 142 species are eatable, 99 species are ornamental plants, 64 species are for animal feed, 50 species are giving attar , 28 species are fibre plants,11 species are used for handicrafts, 5 species of dyes, and the lowest of 3 species for sap plants.