Abstract: Bioassay of the extract partitioned with chloroform from the foliar methanol extract of Aglaia odorata var. chaudocensis (Meliaceae) for insecticidal effects on the imported cabbage worm, Pieris rapae, were carried out. The results showed that the extract possessed high effects of growth inhibithion and stomach poison. Insects fed with the contaminated leaves with 10 g/L extract obtained 96.3% mortality and 22.5% growth ratio on the 7th and the 5th day, respectively after treatment. However, the less effects were showed on antifeeding and contacting poioson. Compared with Toosendanin and Neem oil, the succeessful botanical insecticides, the effects of the extract on stomach poison and growth inhibition were similar to those of Neem oil.