In Guangzhou the photo-sensitive genic sterile line of indica type (N98)has two periods of fertility transformation in a year. It transforms from fertility into sterility in middle May. and the sterility is stable. It transforms from sterility into fertility in early October. When it was combined with 19 different type varieties, they all showed normal seed set rate. good economic characters and significant superiority in yield increase. It transforms from fertility into sterility in middle May. And the sterility is stable. It transforms from sterility into fertility in early October When it was combined with 19 different type varieties, they all showed showed normal seed set rate. Good economic characters and significant superiority in yield increase.