Data envelopment analysis methods(DEA) were used to establish sunflower quality evaluation model in this paper.And sunflower producing area in Jilin province was being as study area,and to explore the relative effectiveness of soil elements on sunflower quality.The study got two conclusions: One was that,53 soil samples showed that DEA were valid,and 5 samples were invalid.This indicated that,the effect of root soil element to sunflower quality was better in study area;the relationship between outputs with ...