Objective To analyse the correlation between blood microelement and the social function of ADHD children,and provide a scientific evidence for ameliorating the social functional of attention dificit hyperactivity disorder (ADHD) children by nutrition. Methods The social function of 144 ADHD children were evaluated by Weiss Functional Impairment Scale-Parent form(WFIRS-P).The levels of microelement including copper,zinc,calcium,magnesium,iron,phosphorus and lead in blood were checked,and calculated the copper/zinc ratio too.Then the correlation of WFIRS-P scores and microelement level was analysed by statistical methods. Results Through the statistical results by t-test,we found the levels of serum zinc (P<0.05) and magnesium (P<0.01) in ADHD children were significantly lower than those in the normal control group,but the others between the two groups and copper/zinc ratio had no significant differences.By the multiple linear stepwise regression analysis,we found that the concentration changes of serum iron associated with ADHD children's risky activities (P<0.05).And the other elements had no significant correlation between social function including family,learning and school,life skills,self-concept and social activities in ADHD children. Conclusion s Zinc,magnesium may be the protection factors of ADHD children.Iron has influence on the risky activities of ADHD children.Imbalance of microelement will cause damage to the social function of ADHD children.