A new method of developing Sunflower cytoplasmic male sterile (cms) line was reported in this paper. Hybrid on the basis of Cms line was used as germplasm source to develop B-line and as Cms source to develop Cms line. First of all, three-way hybrids were obtained by crossing the hybrid with a maintainer, and then selection for selling was made to get recurrent parent plants which was backcrossed with Cms plants segregating from corresponding F₂ line, untill the progeny was genetically similar to the recurrent parent except that it was male sterile. The results showed that segregating ratio of fertility of backerossing pro-genies in A-line fitted the theoretical distribution of a single dominant gene. All plants in A-strains were sterile in testing cross progenies, and fertility segregation did not occure in su-bsequent backcrossing progenies. This method can be used to de-velop new Cms Iines, it provided a new way to use hybrids as ger-mplasms. It can be used to increase seed set, oil content, and resistance to diseases of the breeding materials.