Abstract: The main volatilize component from Camphor leaves was analyzed by GC/MS.The extracts from Camphor leaves using different solvents to the effect of antifeeding,the response of anti –feeding to extracts of different doses of ethanol,the linalool and Camphor camphora of main components from Camphor leaves to activity of antifeeding to Pieris rapae weremeasured by leaf disc test.The results show that the main volatilize components from Camphor leaves are the linalool and Camphor camphora taking 25.013% and eucalyptol taking 13.572% respectively.Bioassay results of different extracts show that the effect of ethanol to antifeeding of Pieris rapae is stronger than that of methanol and ethyl acetate;the indexes of antifeeding response are 97.98,34.33,and 39.71 respectively.The results of extracts of different doses ethanol show that the large the doses,the stronger the anti-feeding.The indexes of anti-feeding response about the linalool and Camphor camphora from its main components are 89.36 and 39.88,it indicated that the anti-feeding activity of Camphor leaves is mainly the effect of linalool and Camphor camphora,and other components maybe have synergistic reaction.

Key words: Cinnamomum camphora, Pieris rapae, feeding deterrence active constituent, bioassay