The costal zone salt marsh is one of the most significant parts of the global biogeoche-mical cycles,and has a profound impact on global change.The fluxes of dimethyl sulfide(DMS)were seasonally measured using chambers over an annual cycle in July 2013(growing season)and in December 2013(non-growing season)in Jiangsu salt marsh wetlands.The results show that cos-tal zone salt marsh wetlands was regarded as a source for DMS.In vegetation zone and bare flat,the maximum occurring at cordgrass(Spartina alterniflora)were 38.068.97 mg·m~(-2)·d~(-1).In the distance from the tidal creek,the fluxes of DMS were 0.350.11 m·g·m~(-2)·d~(-1) in the tidal creek lower than it were 10.305.09 mg m~(-2)·d~(-1) in the recent tidal creek and it were 9.574.04mg·m~(-2)·d~(-1) far away from the tidal creek.The fluxes of DMS in non-growing season were 14.315.80 mg·m~(-2)·d~(-1) higher than it were 5.562.63 mg·m~(-2)·d~(-1) in growing season.The temporal and spatial variation of DMS was influenced by the aboveground vegetation,the rhizosphere of the aboveground and the periodic variation of the tides can also have an effect on DMS fluxes.