The pyrolysates of 10 perfumes,including perillartine,β-ionone,sclareolide,iso eugenol,benzal dehyde,2-acetyl pyrazine,2-acetyl thiazole,3-acetyl pyridine,hawthorn tincture and shu-lan absolute,were identified by on-line gas chromatography-mass spectrometry (GC-MS) under helium atmospheres at 300 ℃,600 ℃ and 800 ℃,respectively.The relative percentage contents of aromatic components were established,and effects of pyrolysing temperatures on amounts of aromatic components formed during the pyrolysing procedure were analyzed.Meantime,the relationship between structures of perfume compositions and amounts of aromatic compounds was speculated and accounted based on the theroy of the structures and property of organic compounds.The results showed that:β-ionone,sclareolide,iso-eugenol,shu lan absolute could be pyrolysed into aromatic compounds (including benzene,indene,naphthalene and their derivates) at 800 ℃,among which the percentage content of the aromatic components in pyrolysates of β-ionone came to 16.290% and that in pyrolysates of shu lan absolute was 5.376%.But aromatic components were not detected in the pyrolysates of 2-acetylpyrazine,2-acetylthiazole,3-acetylpyridine.Therefore,the structures of perfume compositions were an important effect on the amounts of aromatic compounds pyrolysed by perfumes.With the increase of pyrolysis temperature,the aromatic compound percentage in pyrolysates was increased obviously.For example,the aromatic components of β-ionone pyrolysates at 300 ℃ were almost not determined,and the total of aromatic components at 600 ℃ was lower than 1%,but the total of aromatic components at 800 ℃ came to 1628%.As additives used for cigarette,2-acetylpyrazine,2-acetylthiazole and 3-acetylpyridine are suitable.