Abstract:Taking six pest-resistant rice varieties as test materials, a pot experiment was conducted to study the effects of flooding stress on the nutrients of the resistant varieties and its relationship with the feeding amount of brown planthopper（BPH），Nilaparvata lugens (Stl).The results indicated that the content of free amino acid in the stem of rice variety TN1, Babawee, RHT, Ptb33, RP1976-8-6-4-2 and 570011 was influenced greatly by the flooding stress. The content of free amino acid of the rice variety RHT after the flooding and that of RP1976-18-6-4-2 and 570011 after being flooded longer than 3 d were higher than that of the control. The content of free amino acid in the stem of rice variety IR56 was higher than that of the control only on the flooding 3d. The content of soluble sugar in rice variety TN1 was fluctuated and that of rice variety IR56, Babawee, RHT, Ptb33 and 570011 was greatly influenced by flooding stress, which was lower than that of the control after being drowned with water. The content of soluble sugar in rice variety RP1976-18-6-4-2 was higher than that of the control within the first 3 d of flooding and lower than that of the control by flooding more than 5 d .The regression analysis of relationship between the nutrients of rice variety and feeding amount of BPH showed that the feeding amount of BPH biotype Ⅱ and Bangladesh on TN1 and BPH Bangladesh on IR56, Babawee and RP1976-18-6-4-2 was influenced by the content of total free amino acid and soluble sugar after flooding stress. The feeding amount of BPH biotype Ⅱ and Bangladesh on RHT,Ptb33 and 570011 was correlated positively with the content of soluble sugar whereas the feeding amount of BPH biotype Ⅱ on Babawee was correlated negatively with the content of soluble sugar.