A survey on grass resources was conducted in 19 counties in Hainan from November,2005 to March,2006.74 genera and 159 species were collected,which were about 73.27% and 77.56% of total genera and species in grass family in Hainan.And 4 genera and 21 species were not recorded in flora of Hainan.In this paper,the distribution and nutrition value of the collected species were analyzed,and the conservation of these resources was also discussed.