Abstract: To analyze the constituents of the essential oils extracted from Hangzhou white chrysanthemum, one of the commercial breeds coming from the flowers of Chrysanthemum morifolium, treated by sun-dried and sulfur-fumigated process, and to provide scientific evaluation for its quality control. The essential oils of seven Hangzhou white chrysanthemum samples were extracted by water-steam distillation and separated by GC capillary column chromatography. The contents of the components were quantitatively determined with normalization method, and their chemical constituents were identified by GC/MS. The results showed that 64 constituents were separated and identified from the components of the essential oils of seven Hangzhou white chrysanthemum samples, and they are mostly kinds of different monoterpenoids and sesquiterpenoids compounds. The concentrations of α-pinene (dextro)， L-borneol， carvacrol and caryophyllene oxide after sulfur-fumigated process were much lower than that before sulfur-fumigated process. On the contrary the concentrations of (-)alloaromadendrene and γ-selinene were higher than that before. Thus, sulfur-fumigated processing of Hangzhou white chrysanthemum should be strictly controlled.