To excavate blast-resistant germplasms of Oryza rufipogon Griff. indigenous to Hainan , 410 accessions from 41 natural populations were identified for the resistance to leaf blast at the seedling stage, by naturally infected with the pathogen in 2010. In 2011, 121 accessions of 37 natural populations were identified for the resistance to neck blast at the heading stage by artificial spray inoculation with blast isolates (YC25). In 2012, 2461 accessions of 80 natural populations were investigated under field conditions for the resistance to leaf blast. The results showed that 22 and 117 accessions were highly resisitant (HR) and resisitant (R) to leaf blast at the seedling stage, respectively. Among the 138 accessions, 4 and 3 were respectively HR and R to neck blast, and 14 showed resistance under field conditions. In addition, 4 accessions which were susceptible or unidentified at the seedling stage, showed resistance both to neck blast and to leaf blast under field conditions. These resistant accessions come from Haikou, Wenchang, Wanning, Sanya, Chengmai, and Dongfang. The findings may provide reference for further study and utilization of Oryza rufipogon Griff.