The F2 population of Zhenshan 97B / xiushui 13 were used for the material to test the effect of the fertility QTL to provide a theoretical basis for the utilization of heterosis between Indica and japonica, based on the F1fertility phenotypes of Indica-compatible Male Sterile Line. The results showed that: There was a QTL qPF5 controlling the pollen fertility with a value of additive effect-8.65 and a contribution rate of phenotype11.25%. Two QTLs conferring spikelet fertility were detected( qSF5 and qSF6)....