Abstract: Rapeseed fermentation liquid by Bacillus methylotrophicus BM-24, rapeseed fermented liquid and LB fermentation liquid by B. methylotrophicus BM-24 were tested for their effects on Fusarium wilt in dwarf banana seedling stage and on plant growth in pots. Results showed that the three fermentation liquids treatments were effective in control of Fusarium wilt in dwarf banana seedling stage and promotion of plant growth. At the end of the experiment (51 days), disease index of the banana treated with BM-24 fermentation liquid of rapeseed, rapeseed fermented liquid and BM-24 fermentation liquid of LB decreased by 82, 64 and 49 respectively, in comparison with no treatment. The fresh weight of above-ground part of seedlings increased by 81.19, 60.60 and 59.30 g respectively, and the fresh weight of under-ground part increased by 38.25, 35.03 and 30.83 g respectively. Plant height increased by 23.10, 18.81 and 14.38 cm respectively. Fusarium oxysporum f. sp. cubense concentration in the soil reduced from 10⁵ cfu/g soils to 10³, 10³ and 10⁴ cfu/g soil respectively. All fermentation liquid treatments could significantly improve activity of the protective enzymes of the dwarf banana in seedling stage, inhibit decomposition of chlorophyll and decreases the root conductivity. Among them, BM-24 fermentation liquid of rapeseed showed the most significant effect. The maximum activity of SOD, CAT and POD were 1.3、1.4 and 1.5 times higher, respectively, compared to the non-treatment. And the contention of chlorophyll a, b and chlorophyll were 2.7, 2.3 and 2.6 times higher, respectively. The electrical conductivity was reduced by 31.9%. Rapeseed cake could improve the effect of colonization of BM-24 significantly.