Allelopathic effects of vanillin and cinnamic acid with different concentrations on Verticillium dahliae, and eggplant seed germination and seedling growth were studied in laboratory and bioassay experiments. The results showed that vanillin and cinnamic acid had different allelopathy effects on Verticillium dahliae. Cinnamic acid could inhibite spore germination of Verticillium dahliae at all concentration levels, with maximum effect at 0.5mmol/L. Vanillin inhibited the spore germination at 0.1mmol/L, while promoted germination at other concentrations. The bioassay results indicated that cinnamic acid promoted seed germination and seedling growth of eggplants at 0.1mmol/L, whereas, inhibitory effects were found at other concentrations, and inhibitory rates were enhanced along with concentration increase. Vanillin at different concentrations promoted the seed germination and seedling growth of eggplants, and the maximum stimulative effect occurred at 0.5mmol/L.