Abstract:The studies for plant height, panicle characters, esterase isozymic electrophoregrams of 19 rice lines isolated from offspring of rice cultivar Mastumue and water rice were conducted. The results showed that the characters wres different among the lines and their female parent. However,phenotypical characters of these lines were the same as those of rice. Most isozymic electrophoregrams of these lines were the same as those of female parent Matsumae, and showed 5 isozyme band patterns:complementary band, new band, complementary and new band, female parental band and female parent band lackage patterns. Furthermore,the results also indicated that high generation progenies, acquired some genes of male parent water rice, and in which the genes were expressed.