OBJECTIVES: The purpose of this study is to investigate a cut-off value for screening children with ADHD in community based sample using the Korean Child Behavior Checklist (K-CBCL) and the Korean ADHD Rating Scale (K-ARS). METHODS: Children aged 6 to 8 (n=661) participated in this study. The K-CBCL and the K-ARS were used as the screening instruments. Diagnoses were confirmed through the Diagnostic Interview Schedule for Children Version IV (DISC-IV). RESULTS: Of the 189 subjects who underwent the DISC-IV, 26 subjects were diagnosed as ADHD. In the K-CBCL, scores in the attention problems, externalizing problems and total behavioral problems were positively correlated with the total score of the K-ARS. The K-ARS-Parent version (K-ARS-P) and above three scales in the K-CBCL showed significant screening validity in the ROC curve analysis. The reasonable level of sensitivity, specificity, and negative predictive value were obtained in the total scores > or =90th percentile in the K-ARS-Parent and > or =60T scores in the K-CBCL attention problems. The optimal level of specificity, positive predictive value and negative predictive value were obtained when combined the K-CBCL (> or =60T scores in the attention problems and > or =63T scores in the total problems) and the total scores > or =90th percentile in the K-ARS-P. CONCLUSION: The combined use of the K-CBCL and the K-ARS-P may serve as useful screening methods for ADHD children.