The male sterility of rice is usually by a couple of major gene and some modification genes,Modification genes can be nuclear gene or cytoplasm gene. The expression of characteristics of the major gene could be influenced whether the coondination of modification genes between nuclear and cytoplasm .At present ,The sterile lines in three-line are almost cytoplasm-nuclear interaction types. A pair of photo(thermo)-period-sensitive fertile major gene and some corresponding modification genes photo(thermo)-period-sensitive genic male-sterile together.Because this two kinds of “Sterility” are non-sterile gene function, and is a degeneration in fact, So the fertility will be expressed in the specific photo(thermo) conditions,or shown as sterilely when conditions not possessing.