The effective component of leaves and stems of Solanum lycopersicum were extracted with alcohol-water solution by heating reflux method, and the insecticidal activities of extracts were detected against aphid of Koelreuteria paniculata Laxm. The results showed that the extracts were toxic to Aphid of Koelreuteria paniculata Laxm with LC50 of 13.23 mg/ml. The results of the control efficiency determination experiment in the field indicated that the control efficiency of the extracts was 98.8%against the insect when the concentration of extracts was 80 mg/ml. The control efficiency of the extracts was 98.5%against the insect when the concentration was 40 mg/ml. Therefore, the extracts from leaves and stems of Solanum lycopersicum had a good insecticidal activity against aphid of Koelreuteria paniculata Laxm.%用乙醇水加热回流法提取番茄茎叶的有效成分，并就提取物对栾树蚜虫的杀虫活性进行测定。结果表明：室内叶片法生测后，提取物对栾树蚜虫毒效的LC50为13.23 mg/ml；田间防治效果显示：当浓度为80 mg/ml时，对栾树蚜虫的防治效果为98.8%，当浓度为40 mg/ml时，对栾树蚜虫的防治效果为98.5%。因此，番茄茎叶提取物对栾树蚜虫有较好的杀虫效果。
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