Abstract:High generation space-induced rice lines (6th and up) derived from the seeds of Yue-xiang-zhan and Qing-hua-zhan, which were carried by high spaced balloon. The agronomic character including plant type, tillering ability and yield of new lines were better than the original ones. The blast resistance of these space-induced lines and their original varieties had been screened based on the test of resistance spectrum to fungi in greenhouse by using 36 representative isolates with different pathogenicity and genetic lineages of Magnaporthe grisea from Guangdong. Space inducement could cause the blast resistance variation. Some induced lines had stronger blast resistance than the original varieties, and the others were more susceptible. The resistance variation was complicated, different seeds had different variation. The variation of resistance by space inducement might be from mutation of different resistance genes. Special germplasm with broad resistance spectrum to blast could be obtained by space inducement. Yue-xiang-zhan is a variety susceptible to rice blast, whose resistance frequency is just only 25%,while two space-induced lines, YX-8 and YX-9, from Yue-xiang-zhan showed high resistance to blast and their resistance frequency were 94.4%. The neck blast resistance test of these high generation space-induced lines will be tested in future.