大白菜２ｎ配子材料１０５３和四倍体９４－７８杂交，以１０５３为母本连续回交，选育成四倍体大白菜Ｔ－６。性状观察结果表明，开花期Ｔ－６较１０５３抽薹晚，花茎粗，植株高大；结球期叶片宽大、肥厚，株高、单球重小于１０５３，但外叶数少，净叶率高，叶球充心快，较１０５３早熟。 Chinese cabbage 2n gamete material 1053 and tetraploid 94-78 were hybridized back to 1053 as female parent and bred into tetraploid Chinese cabbage T-6. The results of traits observation showed that T-6 at flowering stage was later than that of 1053 at the bolting stage, with thick stems and tall plants. Leaf size at jointing stage was large, hypertrophy, plant height and single-ball weight was less than 1053, Ball fast heart faster than 1053 precocious.