Abstract: A new type of cytoplasmic male sterility line of Brassica napus(Eru CMS) was taken as a sterile source.The cytoplasmic male sterility genes were successfully transferred to Purple-Caitai by distant hybridization and backcross.These methods accelerated the transformation process,such as:tissue culture,individual selection and allopatric propagation.Results showed that the cytoplasmic male sterility line of Purple-Caitai had many advantages,including non-etiolation of leaves during low environmental temperature.In addition,terility was steady,nectary was normal,and degree of pollen steritity and rate of sterile plants were 100%.