Abstract: In this study we selected two photoperiod_sensitive genic male steril e(PSGMS) lines of indica rice derived from Nongken 58S: Peiai64S which is difficult to reverse fertility under short_day condition, and 8902S which is easy to reverse fertility. A cross F１ and F２ populations from the cross between Peiai64S and 8902S were used for a molecular marked_based investigation into the inheritance, gene mapping and interaction of PSGMS fertility reversibility under 4 different short_day conditions. The inheritance of fertility reversibi lity showed quantitative trait performance and 7 QTLs with a complex epistasis interaction detected in PSGMS, they are S2, S3a, S3b, S5, S8 and S10. The gene interaction was really existed and effected the fertility reversibility in PSGMS. The types and kinds of epistasis were showed complexity. The genetic variance explained was between 2.15%～10.07% of fertility reversibility in PSGMS.