In order to screen suitable rapeseed varieties with high yield and quality in saline soil of coastal beach and to provide a reliable theoretical basis for more efficient use of the coastal beach resources, the characteristics of winter traits, biological and yield component characteristics of 11 Brassica napus L. varieties including five varieties breeded by key laboratory of marine biology, Jiangsu Province (NY) and other six varieties were studied in northern-coastal middle-degree saline mudflat of Jiangsu province in 2009. The results were as follows: The growth of NY cultivars was better than other 6 varieties in the saline soil. The branches of NY cultivars were grown from the base of the main stem. There were more branches in NY cultivars than other 6 varieties. There was no significant difference in main stem diameter among the NY cultivars, Ningyou 16, Sanbei98, Qinyou 66 and Qinyou 9; while the main stem diameter of NY cultivars was higher than Baozayou 1 and Qinyou 33. There was little difference in plant height, pod length and pod width for all varieties, the yields of NY cultivars were significantly higher than Baozayou 1, Qinyou 66, Qinyou 9 and Qinyou 33. The correlation were significant between the first and the second numbers of branches and oilseed yields.