Abstract: Rice seeds were soaked in solutions with different concentrations of GeO2 ranged from 0 to 3.0 mg • L- l. Respiratory intensity, quantity of soluble sugar and activity of amylase were tested during germination. It was shown that CeO2 promoted all the indexes in the first stage of germination, but tile promotive effect was decreasing late and at last GeO2 became inhibitive, lsoenzyme of amylase was analyzed by PAGE. The results showed that the newly appeared isoenzyme of amylase in the germinating rice seed can releave the toxicity of GeO2.