Abstract: The relative element contents of soil and crops affected by power plant smoke over long time and its influence on crop quality were studied through sampling of soil and corps in both polluted and non-polluted areas. Results show significant relationship between soil pH,total S and F contents and available S and F contents with SO₂ pollution from power plant smoke. S and F accumulation is observed in polluted soils. S content in wheat leaves and grains and the thousand-grain weight, protein content and wheat starch content were also monitored.S content in wheat leaves and grains are positively related to SO₂ pollution in the air. S accumulation is not observed in grains, but does exist in leaves. S content has a positive correlation with protein content,meaning that a slight SO₂ increase in the air improves wheat quality.