Abstract: The monitoring result of atmospheric sulfur isotopic composition in Hengyang from 1996 to 1997 is as follows:atmospheric precipitation δ(³⁴S) average value is 6.12‰,atmospheric SO_-2 δ(³⁴S) average value is-3\^48‰,and atmospheric aerosol δ(³⁴S) average value is 10\^73‰.The numerical value is in accordance with the rule of fractionation of sulfur isotope.The research holds the viewpoints that southwest airstream exerts little influence on Hengyang’s atmospheric environment,and the southing airstream from the north is further inferred to be the main cause influencing local atmospheric sulfur.The influence of biogenic sulfur fountain on precipitation cannot be ignored.Sulfur isotopic monitoring results in Hengyang,Pearl River delta and cities in the north part of Guangdong do not hold out the theory of precipitation sulfur isotope area differentiation.