Genetic effects for grain traits of CMS-FA hybrid rice, which contained 10 parents and 25 F] hybrids, were analyzed by the additive-dominant model （ AD ） . The results showed that 1000-grain-weight and grain length of CMS-FA hybrid rice were mainly controlled by additive effects and their narrow heritabilities were relatively high tat very significant level, so it was better to choose the two traits in the early generations, while the genetic variances of grain width and ratio of length to width were not ideal. The parents＇ predictive value of the additive effects indicated that Jinhui 3 was a good parent which could largely increase grain weight, grain length and the ratio of length to width. The dominant effects of the hybrids had larger differences in 1000-grain-weight while the slight differences were ob- served only in grain length, grain width and the ratio of the length to width.
Fujian Science and Technology of Rice and Wheat