Abstract：Adopting filter paper culture method, this research investigated the effect of tannic acid,salicylic acid and the mixture（1∶1） on tomato（Lycopersicon esculentum Mill.） seed germination andseedling growth. The results showed that tannic acid presented a trend of promotion in low concentration and
inhibition in high concentration. When the tannic acid concentration reached to 0.2 g·L-1, it started to restrain seed germination and seedling growth. Salicylic acid and the mixture appeared to inhibit the seed germination and the hypocotyl and germ growth, and the inhibitory effects were enhanced along with the increase of their concentration, Whereas, salicylic acid and the mixture showed a tendency of promotion in low concentration and
inhibition in high concentration effect on tomato radide growth. When the salicylic acid concentration reached 0.5
g·L-1, it showed 100% inhibitory effect. At the same time, the intensity of inhibitory effects showed a trend of
salicylic acid ＞ 1∶1 mixture ＞ tannic acid under the concentration of 0.5 g·L-1.
