Abstract: This invention describes a work including both genetic analysis and development of a marker set for a photo-sensitivity module underlying transgressive photo-sensitivity (TPS) phenomenon found in the breeding improvement of rice blast resistance by the introduction of Pigm gene, belonging to the field of rice molecular genetics and biotechnology breeding. By using bi-parental RIL populations derived from TPS crosses with a Pigm donor as one parent, genetic analysis has been carried out to map the photo-sensitivity module [qHd6+qHd7] under both long-day (LD) and short-day (SD) conditions. With the aid of the molecular marker set proposed by this invention for this module, breeders can predict the degree of TPS in northern early Geng/japonica rice progenies derived from crosses with Pigm donor as one parent when they are doing parental selection or screening progenies carrying Pigm without strong TPS in blast-resistant biotechnology breeding schemes.