[Objective] The aim was to illustrate the relation between Leptocybe invasa and eucalyptus, so as to provide the basis for scientific control of L. invasa. [Method] The chemical components of eucalyptus were extracted by solid phase micro-extraction （SPME） technique and ethanol extraction method, and detected by gas chromatograph-mass spectrometer. The relative contents of various components were determined by area normalization. [Result] When eucalyptus was damaged by L. invasa, not only some substances disappeared, but also new substances were induced. Among 4 induced volatiles, the content of terpinolene was the highest of 37.66%. Eight new chemical substances were also detected from the ethanol extract of damaged leaves, and the content of 3-phenyl-2-propenyl phenpropionate was the highest of 30.95%.[Conclusion] The damage caused by L. invasa had obvious effect on composition and contents of chemical components of eucalyptus.
