Bioactivity of 18 samples of crude methanol extracts from 14 species of plants extracted by cold soak method against Sogatella furcifera and Nilaparvata lugens were tested in this paper. The results showed that the leaf, seed and bark of Itoa orientalis Hemsl, the fruit of Daphniphyllum calycinum Benth and the whole plant samples of Perilla frutesens L. showed high contact toxicity with the corrected mortalities against the macropterous of S. furcifera and N. lugens both over 80%. The contact toxicity of the peel of I. orientalis and the whole plant samples of Baeckea frutescens Linn. were between 50% and 80% after treated for 48h. The sample of Cnidium monnieri (L.) Cuss had high contact toxicity to S. furcifera and moderate toxicity to N. lugens. Phytolacca acinosa Roxb. showed moderate contact toxicity to S. furcifera and low toxicity to N. lugens. The contact toxicity of the other 8 plant samples to S. furcifera and N. lugens were lower than 50%. The oviposition repellent rate of the seed and bark of I. orientalis Hemsl, the fruit samples of C. monnieri (L.) Cuss. and D. calycinam Benth. to S. furcifera and N. lugens were all over 80% while the repellent activity of the rest plant samples were all lower than 60% after treated for 72h. The antifeedant activities of the plants with high contact toxicity and repellent activity were tested. The leaf of I. orientalis Hemsl showed the highest antifeedant activity against the 4th instar nymphae of S. furcifera and N. lugens, followed by the seed of I. orientalis Hemsl，the peel of I. orientalis Hemsl, the fruits of C. monnieri (L.) Cuss and D. calycinam Benth and the bark of I. orientalis Hemsl.