This paper presents the diversity of plants resources of Khau Ca Tokin snub-nosed monkey species and habitat protected area, Ha Giang province. The study area is independence site on limestone, where an endemic and critically endangered primate species living. Base on the field surveys, the flora of this area hasbeen counted for 128 families, 361 genera, 539 species of 4 higher vascular divisions. This flora contents 50 endemic species for the flora of Vietnam, accounting 58.3 percent 9.28 percent of total. There are 314 useful species, accounting 58.3 percent in total species of the flora
it includes: 126 medine plant species, 73 edible species, 46 tree species that would support timber, 47 species would be used as ornamental, 21 species would be used to extract essential oil, plant oil, tannin... and some others would be used for fiber support. There are 19 species that belong 18 genera, 16 families are determined as feeding species which would be used by the Tonkin snub-nosed monkey.