Sulfur dioxide and sulfate aerosols in the atmosphere are significant factors leading to acidification of the atmospheric environment and worsening the pollution of acid deposition. Because of the fingerprint characteristics of the stable sulfur isotopic composition, sulfur isotope has been widely adopted in environmental researches concerning sulfur cycle and source identification. In this study, the atmospheric environment of Jinhua City, central Zhe極ang Province, was continuously monitored, and the sulfur isotopic composition of SO2 and sulfate aerosols in the atmosphere was analyzed. The results indicate that the variation of 34S values for SO2 ranges from 1.0 to 7.5, and annual average is 4.7±2.3, whereas that of sulfate aerosols ranges from 6.4 to 9.8，and annual average is 8.1±1.0. The 34S values for SO2 have significant seasonal variations, which are 7.0 in winter and 3.3 in summer. These variations cannot be attributed to a single factor, and we suggest a temperature-dependent isotope equilibrium fractionation and elevated biogenic sulfur emissions of isotopically light S in summer may be the main control領(lǐng) mechanisms. Furthermore, we also discuss the 34S model of atmospheric SO2 oxidation to form sulfate, and suggest that heterogeneous oxidation dominates in the oxidation reactions of atmospheric SO2 in the central Zhe極ang Province. We further suggest that the relative humidity in the atmosphere plays an important role in the oxidation mechanism of atmospheric SO2. IsoPrime 穩(wěn)定同位素質(zhì)譜儀