Abstract：Intergeneric hybrids between Sinapis arvensis（Yeyou2000-1）and Brassica napus var. Parol were produced by bud-pollination .The hybrids were amost sterile and only a few F2 seeds were harvested under the natural condition. A male sterile plant 200210-1 showing no pollen release upon flowering was selected from F2 population after open pollination. Using Parol as a recurrent parent to pollinate the male sterile plant, the ratio between male fertile and sterile plants was 1﹕1 in BC1 、BC2 and BC3 generations. All except one F1 progenies from test crosses using restorer and maintainer lines of Polima and 681 CMS， maintainer line of recessive male genic sterility 86A and other 33 B. napus varieties or lines showed fertility segregation with the ratio of 5﹕3 in 20 combinations， 1﹕1 in14 combinations and 3﹕1 in 3 combinations; and the progeny of one male sterile combination became fertile. All these results indicated that the male sterility of 200210-1 most likely were dominant male genic sterility.