Abstract: The induced resistance effects of Trichoderma pseudokoningii SMF2 on soft rot of the Chinese cabbage‘Fengkang 70’were studied by measuring the lesion length，and the control mechanism of T. pseudokoningii SMF2 was deduced from its effects on growth，endogenous hormone contents and protective enzyme activities of Chinese cabbage seedlings inoculated with the main pathogens，Erwinia carotovora ssp. carotovora or not. The results showed that the lesion length of soft rot in petiole of Chinese cabbage were decreased significantly when treated with T. pseudokoningii SMF2（spore ≥ 0.1 g · kg^-1）. The fresh weight of shoot and root，ratio of root to shoot of seedlings，zeatin riboside（ZR）， indole acetic acid（IAA）and abscisic acid（ABA）contents，polyphenol oxidase（PPO）and peroxidase （POD）activities in leaves of Chinese cabbage seedlings treated by T. pseudokoningii SMF2 were
increased significantly，whether they were inoculated with Erwinia carotovora ssp. carotovora or not. Based on these results，it suggested that growth-promoting and induced resistance were probably the main reasons for T. pseudokoningii SMF2 controlling soft rot of Chinese cabbage.

Key words: Chinese cabbage, Trichoderma pseudokoningii SMF2, soft rot, protect enzyme, endogenous hormones