Abstract: Rice blast, caused by fungus Magnaporthe grisea, is one of the most serious diseases of rice and has become a serious threat to food security. Yuanbaozhan is a new rice material. Improving the rice resistance to rice blast through genetic improvement methods is the most effective and safe way in the present. Yuanbaozhan has an broad -spectrum resistance to rice blast pathogen, and it has high resistance to 23 strains among 25 blast strains collected from different regions in Guangdong province. Its resistance frequency is 92%. In this study, we made a combination to establish genetic population F1, F2 among which population is from the crosses between Yuanbaozhan and Yuexiangzhan. Evaluation was conducted with Magnaprthe oryzae isolate GD00-193a, the results showed that the resistant and susceptible plants in F2 population fitted the ratio of 3:1, indicating that the resistance of Yuanbaozhan to the rice blast was controlled by a dominant gene or a QTL locus. With the bulked-extrems and recessive-class approach analysis, the rice blast resistance gene was mapped at the genome region between RM136 and RM549.