This paper Stuffed with twelve important grain and vegetable crops, studied the injury symptom, dose reaction, injury threshold value and influential factor of main pollutant SO2 on various plants, tested the dynamic transformation of POD, CAT, MDA, soluble protein, free Pro and chlorophyll of resistant plant and sensitive of these physiological biochemical transformation with plant resistant ability. Meanwhile, simply studied the protective role of the five compounds on plant. The result indica...