Abstract: Variation of the volatile components from leaf of Syringa Oblata Lindl. at different season was described. The volatile substances from leaves of Syringa Oblata Lindl. were extracted by hydro-distillation. The components were separated by gas chromatography and identified by gas chromatography-mass spectrometry (GC/MS). The results show that the yield and composition of the volatile oil at different season are notably varied. The major compounds of the volatile oil from leaves of Syringa Oblata Lindl. are terpene constituents in May. The major compounds of the volatile oil from leaves of Syringa Oblata Lindl. are 3-hexen-1-ol, α-patcholene and geranyllinalool in June and July.