Abstract: Yi-DS is a specialized rice as short photoperiod low temperature induced male sterile, and as long photoperiod high temperature induced male fertile. It expressed characters between indica and japonica, genetic complexity and more generation for transferring a sterile line. In the area of South China, seed production of hybrid rice is divided into first-crop (early) season and second-crop (late) season. This speciality may prevent a sterile line from transformation of male sterility caused by cold current (low temperature) at the booting stage, and therefore success the seed production. The practical use of this germplasm may develop a change in two-line hybrid rice breeding in South China.