Abstract: The paper mainly deals with the sulfur contents and its dominant in soils and the yield effects with sulfur fertilizer applied in agro-ecosystems．The major sources and behaviors of sulfur-contained compounds in the atmosphere，the compensatory effects with its optimal concentration and some damages to plants with its excessive contents are discussed as wel1．It has clearly indicated that soil sulfur contents vary with locations and．soil types and the availability of sulfur to plants differs with sulfur status，and some differences in sulfur requirements among plant species also exist．However，sulfur in the atmospheric environment mainly comes from nature resource，e．g．volcanic eruption and anthropogenic one releasing from fossil fuel(coal with high sulfur content)．Exchange and some balance of sulfur between the atmosphere and plant ecosystem occur actually， A certain concentration of atmospheric sulfur can provide some supplementary sulfur for plant growth，but an excessive amount must be harmful to the normal growth of plant and it’s physiological aspects．