Abstract: The differences of the floral characters，bee pollination and seed yield among dominant genic male sterile（DGMS）line，cytoplasmic male sterile（CMS）line and inbred（SI）line of cabbage 02-12，01-20 were studied. The results showed that the differences of the corolla diameter，stamen length，anther length，petal length，bud diameter，the proportion of dead buds at the first branch and the second branch，nectary surface area，single flower nectar volume，the number of visiting bees，the time of bees staying on the flower，seeds per siliqua and seed yield between DGMS and CMS of lines 02-12 and 01-20 were significant. Above traits in DGMS lines were significantly better than those of CMS lines. The correlation of seed yield with main flowering and seed setting characteristics was：Corolla diameter（r = 0.907，P＜0.01），the number of visiting bees（r = 0.893，P＜0.01）and the proportion of dead buds at the first branch（r =–0.891，P＜0.01）.

Key words: cabbage, DGMS, CMS, floral organ, bees pollination, seed yield