Abstract: Genetic characteristics of CMS line Yuanfeng A rice were studied in preparation of breeding a low-photosensitive hybrid.The results showed that Yuanfeng A had the desirable flowering trait,disease resistance,grain quality and crossing ability.The genetic performances at the heading stage of the cross-combinations generated from it were similar to those from Bobai A.Whether the phenotype(photosensitivity) appears in their hybrid F1 at heading stage or not depended on the work of the restorer line at different growth periods.The resultant hybrid showed strong heterosis,improved resistance and excellent grain quality.Therefore,Yuanfeng A was believed to be a potential candidate for breeding high quality three-line hybrid rice.