Aiming at the decreasing fructification index of multi-generation selfing cabbages,the solution of 5%NaCl to improve their flowering affinity index was used，thus to reduce the costs of self-incompatible cabbage seed.The results showed that the use NaCl could increase the flowering affinity index of self incompatibility lines and inbred lines,especially could improve the fourth.It’s abvious to cut the costly on production of seed of self incompatibility lines.