Abstract: Distant hybridization of a new kind of cytoplasmic male sterility of Brassica napus(2n=4x=38) and Purple-Caitai was carried out.Purple-Caitai was used as the recurrent parent to continue backcross.Agronomic and quality traits of the hybrids and backcross progenies of Brassica napus×Purple-Caitai were analyzed.The results showed that the donor parent and the recipient parent exhibited nucleus replacement,the values of agronomic traits and quality traits of hybridization and backcross progenies had a certain fluctuation and the higher the generation of material,the more similar to the recurrent parent,while the variation range of lower generation was wide.